Definitions

locked-in

ADJECTIVE

booked

Synonyms

STRONGEST

contracted engaged reserved

STRONG

billed slated

WEAK

lined up

Antonyms

WEAK

free liberated

ADJECTIVE

enclosed

Synonyms

STRONGEST

confined

STRONG

buried contained embedded encased enfolded immured implanted imprisoned included inserted interred jailed

WEAK

packed up penned in shut up stuffed in wrapped-up

ADJECTIVE

hardheaded

Synonyms

STRONGEST

astute hard-headed hard-nosed headstrong obstinate practical pragmatic rational sensible shrewd sober unsentimental

WEAK

bullheaded cool hang-tough hard hard-boiled intractable level-headed mulish pertinacious perverse pigheaded realistic resolute standpat tough unyielding willful

Antonyms

STRONGEST

irrational stupid submissive unrealistic unreasonable

WEAK

yielding

ADJECTIVE

hard-nosed/hardheaded

Synonyms

WEAK

astute bullheaded hard hard-boiled headstrong intractable levelheaded mulish obstinate pertinacious perverse pigheaded practical pragmatic rational realistic resolute sensible shrewd sober standpat tough unsentimental unyielding willful

Antonyms

WEAK

easy easygoing laid-back merciful

ADJECTIVE

headstrong

Synonyms

STRONGEST

impulsive

WEAK

bullheaded contrary determined foolhardy froward hard-core hard-nosed hard-shell heedless imprudent intractable mulish murder obstinate perverse pig-headed rash reckless refractory self-willed strong-minded uncontrollable ungovernable unruly unyielding willful

Antonyms

WEAK

calm docile moderate obedient submissive tolerant

ADJECTIVE

immovable

Synonyms

STRONGEST

immobile immutable impassive inflexible motionless stationary steadfast uncompromising unshakable unyielding

STRONG

adamant constant fast firm set solid stable

WEAK

dead set on dug in hard-nosed immotile intransigent obdurate quiescent resolute rooted secure set in concrete set in stone standpat stick to guns stuck unalterable unchangeable unmodifiable unwavering

Antonyms

STRONGEST

flexible mobile moving unfixed willing yielding

STRONG

changeable inconstant indefinite loose movable soft supple undecided unstable untrustworthy wavering

ADJECTIVE

inexorable

Synonyms

STRONGEST

implacable inescapable merciless relentless unrelenting

WEAK

adamant adamantine bound bound and determined compulsory dead set on dogged hard harsh hell bent on immobile immovable ineluctable inflexible ironclad like death and taxes mean business necessary no going back obdurate obstinate remorseless resolute rigid set in stone severe single-minded stubborn unappeasable unbending uncompromising unmovable unyielding

Antonyms

STRONGEST

kind merciful nice sympathetic

WEAK

flexible lenient remorseful yielding

ADJECTIVE

intractable

Synonyms

STRONGEST

incurable intransigent stubborn uncompromising unmanageable

WEAK

awkward bull-headed cantankerous contrary fractious hang-tough hard-line headstrong immovable incompliant indocile indomitable insoluble locked mulish obdurate obstinate pat pertinacious perverse pig-headed recalcitrant refractory resolute self-willed tenacious tough unbending uncooperative undisciplined ungovernable unpliable unruly unyielding wayward wild willful

Antonyms

STRONGEST

willing

WEAK

manageable

ADJECTIVE

intractable/intransigent

Synonyms

WEAK

awkward bullheaded cantankerous contrary hang-tough hard-line headstrong immovable incompliant incurable indocile indomitable insoluble mulish obdurate obstinate pat pertinacious perverse pigheaded recalcitrant refractory resolute self-willed set in stone tenacious tough unbending uncompromising uncooperative undisciplined ungovernable unmanageable unpliable unruly unyielding wayward wild willful

Antonyms

WEAK

amenable easy facile manageable

ADJECTIVE

obstinate

Synonyms

STRONGEST

adamant dogmatic headstrong inflexible intransigent recalcitrant steadfast tenacious unyielding willful

STRONG

convinced dogged firm hardened resolved

WEAK

cantankerous contradictory contrary contumacious dead set on hard heady immovable indomitable intractable mulish obdurate opinionated opinionative persistent pertinacious perverse pigheaded refractory relentless restive self-willed strong-minded unalterable unflinching unmanageable

Antonyms

STRONGEST

amenable flexible obedient pliant soft submissive surrendering willing yielding

STRONG

irresolute

WEAK

agreeable cooperative helpful

ADJECTIVE

opinionated

Synonyms

STRONGEST

assertive cocky stubborn

WEAK

adamant arbitrary biased bigoted bossy bullheaded cocksure conceited dictatorial doctrinaire dogmatic hard-line high-handed inflexible intransigent obdurate obstinate one-sided oracular overbearing pigheaded positive pragmatic pragmatical prejudiced self-assertive set in stone set on single-minded tilted uncompromising unyielding weighted

Antonyms

STRONGEST

shy

WEAK

compromising indifferent open-minded

ADJECTIVE

rigid

Synonyms

STRONGEST

adamant austere definite exact fixed hard-line harsh inflexible intransigent rigorous solid stern stringent uncompromising unyielding

WEAK

adamantine bullheaded changeless chiseled dead set determined firm hard incompliant inelastic inexorable invariable obdurate set set in stone single-minded static strait-laced unalterable unbending unbreakable unchanging undeviating unmoving unpermissive unrelenting

Antonyms

STRONGEST

broken easy flexible gentle imprecise indefinite inexact irresolute lenient mild pliant soft tolerant unfixed unreliable willing yielding

WEAK

bending limber pliable

ADJECTIVE

set

Synonyms

STRONG

agreed appointed arranged bent concluded confirmed determined entrenched established firm fixed immovable intent ironclad obstinate pat prearranged predetermined prescribed regular resolved rooted scheduled settled specified stated stipulated

WEAK

certain customary dead set on decisive definite hanging tough inveterate pigheaded resolute rigid set in stone solid as a rock steadfast stiff-necked stubborn unflappable usual well-set

Antonyms

STRONG

changeable indefinite irresolute undecided unsettled variable wavering weak yielding

ADJECTIVE

unbending

Synonyms

STRONG

crisp firm obstinate reserved

WEAK

aloof distant do-or-die dug in formal hard as nails hard-line hold one's ground hold the fort hold the line incompliant inelastic inexorable inflexible intractable obdurate relentless resolute set in stone severe single-minded standing one's ground standing pat sticking to one's guns stiff strict stubborn uncompromising unflexible unrelenting unswayable unyielding uptight

Antonyms

STRONG

flexible soft yielding

WEAK

bending pliable pliant relaxed

ADJECTIVE

unyielding

Synonyms

STRONGEST

adamant determined hard-line hard-nosed immovable implacable inflexible intractable merciless obstinate relentless rigid ruthless single-minded staunch stubborn uncompromising unrelenting unwavering

WEAK

dead set on firm fixed hang-tough hard hard-core hardheaded headstrong immalleable impliable inexorable mulish obdurate pertinacious pigheaded refractory solid stiff stiff-necked tough unbending uncompliant unmovable unswayable

Antonyms

STRONGEST

compassionate cooperative flexible giving irresolute kind merciful nice pliable pliant soft submissive sympathetic wavering weak willing yielding

WEAK

surrendering

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Roughly 80% of the U.K. utility company’s debt is locked in at fixed rates, he explains.

From The Wall Street Journal • May 14, 2026

You’re not locked in to a bet you can’t get out of.

From MarketWatch • May 12, 2026

While Snell struggled, Atlanta’s Spencer Strider was locked in from the start, giving up one hit and striking out eight batters in six innings before being relieved by Dylan Lee.

From Los Angeles Times • May 10, 2026

Beijing and Washington had been locked in a blistering trade war in which US levies on many Chinese goods reached an eye-watering 145 percent.

From Barron's • May 8, 2026

Then two teachers and a district supervisor and Mrs. Wendleken all got locked in the teachers’ room by accident.

From "The Best School Year Ever" by Barbara Robinson

locked-in

Example Sentences

Related Words