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Definitions

zillion

[zil-yuhn] / ˈzɪl yən /
ADJECTIVE
countless
Synonyms
STRONGEST
endless myriad uncounted untold
WEAK
bags of gobs heap immeasurable incalculable infinite innumerous jillion legion limitless loads lots of many measureless mess mint mucho multitudinous numberless oodles passel of peck pile raft scads slew stack tidy sum umpteen uncountable wad whole slew
Antonyms
STRONGEST
few limited
WEAK
calculable countable counted measurable numbered numerable
ADJECTIVE
immeasurable
Synonyms
STRONGEST
boundless immense inexhaustible limitless unfathomable unlimited
STRONG
unmeasurable
WEAK
alive with bottomless countless crawling with endless extensive illimitable indefinite inestimable jillion large measureless no end of no end to umpteen unbounded uncountable unreckonable vast
Antonyms
STRONGEST
limited restricted
WEAK
bounded calculable finite measurable
ADJECTIVE
incalculable
Synonyms
STRONGEST
boundless enormous immense infinite unforeseen untold vast
WEAK
capricious chancy erratic fluctuant iffy incomputable inestimable innumerable jillion measureless no end of no end to numberless uncertain uncountable unfixed unpredictable unreckonable whimsical without number
Antonyms
STRONGEST
bounded limited little minute small tiny
WEAK
calculable countable measurable
ADJECTIVE
incomputable
Synonyms
WEAK
boundless capricious chancy countless enormous erratic fluctuant iffy immeasurable immense inestimable infinite innumerable jillion measureless no end of no end to numberless uncertain uncountable unfixed unforeseen unpredictable unreckonable untold vast whimsical without number
ADJECTIVE
measureless
Synonyms
WEAK
boundless capricious chancy countless enormous erratic fluctuant iffy immeasurable immense incomputable inestimable infinite innumerable jillion no end of no end to numberless uncertain uncountable unfixed unforeseen unpredictable unreckonable untold vast whimsical without number
ADJECTIVE
numberless
Synonyms
WEAK
countless endless heaps incalculable innumerable jillion many multitudinous myriad no end of no end to numerous umpteen uncountable uncounted unnumbered untold
Antonyms
WEAK
counted finite limited numbered
ADJECTIVE
numerous
Synonyms
STRONGEST
big diverse great large plentiful various
WEAK
copious infinite legion lousy with multifarious multitudinal multitudinous populous profuse rife scads several sundry thick umpteen voluminous
Antonyms
STRONGEST
little miniature similar small tiny uniform unimportant
WEAK
deficient few lacking
ADJECTIVE
umpteen
Synonyms
WEAK
considerable countless infinite innumerable lots of many millions numerous umteen
ADJECTIVE
uncountable
Synonyms
WEAK
boundless capricious chancy countless enormous erratic fluctuant iffy immeasurable immense incomputable inestimable infinite innumerable jillion measureless no end of no end to numberless uncertain unfixed unforeseen unpredictable unreckonable untold vast whimsical without number
NOUN
number
Synonyms
STRONGEST
amount collection company estimate lot many product quantity sum total volume
STRONG
abundance caboodle conglomeration crowd flock horde jillion multitude plenitude plenty slew throng totality whole
WEAK
manifoldness umpteen
Antonyms
STRONGEST
part
STRONG
lack
WEAK
letter one

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.

“I hadn’t seen it in a zillion years, and when I saw it, I understood it a little bit more. It made me feel tense, but I also thought, ‘Oh, interesting.’

From Los Angeles Times • Mar. 3, 2026

Asset managers and financial advisers have concocted a zillion ways to disguise their fees.

From The Wall Street Journal • Oct. 10, 2025

I bet the dorms are nicer, and not everyone needs to go to a school with a zillion people, many of whom are deranged.

From Slate • Jun. 12, 2025

“Z” the zebra is still zooming through the wild, and a zillion zealous searches have returned zilch.

From Seattle Times • May 1, 2024

Park Avenue was my favorite in the spring because of the million zillion tulips in the huge flower beds in the middle of the street—yellow, pink, orange.

From Absolutely Almost by Lisa Graff