ascertained

ADJECTIVE

certain

Synonyms

STRONGEST

absolute clear definite genuine positive real safe sure true undeniable

WEAK

authoritative conclusive confirmable demonstrable destined determined establishable evident firm fixed guaranteed having down pat in the bag incontrovertible indubitable infallible irrefutable known on ice plain predestined provable reliable salted away set sound supreme trustworthy unambiguous undoubted unequivocal unerring unmistakable verifiable

Antonyms

STRONGEST

counterfeit doubted doubtful false invalid uncertain unreal unsure vague

WEAK

questionable unpredictable unreliable

ADJECTIVE

discovered

Synonyms

STRONGEST

detected disclosed exposed identified invented

STRONG

disinterred espied explored learned observed opened originated perceived presented recognized revealed shown sighted spotted unearthed unlocked unveiled

WEAK

famous happened upon real searched out well-known

Antonyms

WEAK

hidden lost unfound

ADJECTIVE

established

Synonyms

STRONGEST

accepted approved closed concluded confirmed endorsed identified

STRONG

achieved assured authenticated corroborated demonstrated determined guaranteed objectified proved substantiated upheld validated verified

WEAK

certain found out sure undeniable valid

Antonyms

STRONGEST

disapproved

STRONG

uncertain

WEAK

false insolvent invalidated temporary unsound untrue

ADJECTIVE

guaranteed

Synonyms

STRONGEST

approved assured endorsed insured pledged protected secured surefire

STRONG

affirmed attested bonded certified confirmed plighted sealed warranted

WEAK

for a fact for sure have a lock on on ice sure sure-enough

Antonyms

STRONGEST

disapproved uncertain

WEAK

indefinite insecure unsure

ADJECTIVE

inarguable

Synonyms

WEAK

absolute authoritative clear conclusive confirmable definite demonstrable destined determined establishable evident firm fixed genuine guaranteed hard having down pat in the bag incontestable incontrovertible indisputable indubitable infallible irrefutable known on ice plain positive predestined provable real reliable safe salted away set sound supreme sure sure thing true trustworthy unambiguous unassailable undeniable undisputable undoubted unequivocal unerring unmistakable unquestionable verifiable

ADJECTIVE

incontestable

Synonyms

WEAK

absolute authoritative clear conclusive confirmable definite demonstrable destined determined establishable evident firm fixed genuine guaranteed hard having down pat in the bag inarguable incontrovertible indisputable indubitable infallible irrefutable known on ice plain positive predestined provable real reliable safe salted away set sound supreme sure sure thing true trustworthy unambiguous unassailable undeniable undisputable undoubted unequivocal unerring unmistakable unquestionable verifiable

ADJECTIVE

observed

Synonyms

STRONGEST

attended checked detected noticed realized recognized

STRONG

beheld contemplated descried discerned discovered espied examined found heard heeded inspected marked noted perceived regarded revealed scrutinized seen surveyed viewed watched

WEAK

looked at

Antonyms

WEAK

abandoned desecrated forgotten unnoticed unperceived unseen

ADJECTIVE

unassailable

Synonyms

STRONGEST

absolute conclusive indisputable infallible irrefutable undeniable unequivocal

WEAK

authoritative clear confirmable definite demonstrable destined determined establishable evident firm fixed genuine guaranteed hard having down pat in the bag inarguable incontestable incontrovertible indubitable known on ice plain positive predestined provable real reliable safe salted away set sound supreme sure sure thing true trustworthy unambiguous undisputable undoubted unerring unmistakable unquestionable verifiable

Antonyms

STRONGEST

disputable doubtful dubious imperfect indefinite questionable refutable uncertain unsure vague

ADJECTIVE

undisputable

Synonyms

WEAK

absolute authoritative clear conclusive confirmable definite demonstrable destined determined establishable evident firm fixed genuine guaranteed hard having down pat in the bag inarguable incontestable incontrovertible indisputable indubitable infallible irrefutable known on ice plain positive predestined provable real reliable safe salted away set sound supreme sure sure thing true trustworthy unambiguous unassailable undeniable undoubted unequivocal unerring unmistakable unquestionable verifiable

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.

The study suggested that the current outbreak is "larger than currently ascertained" and that its "true magnitude remains uncertain".

From BBC • May 19, 2026

The exact number of crew members could not be ascertained but the source added it could be between six and eight people.

From BBC • Jan. 16, 2026

Both Prieur and Mafart had been involved in planning the operation back in Paris—it was Prieur who had first ascertained the ship’s itinerary by calling Lloyd’s of London and posing as a journalist.

From Slate • Jul. 22, 2025

But from Thames Verlet drove straight to Marsden Wharf, where he visited the Rainbow Warrior, ate a piece of cake, and ascertained the schedule for the evening.

From Slate • Jul. 22, 2025

The eight ridiculous Dresdeners ascertained that these hundred ridiculous creatures really were American fighting men fresh from the front.

From "Slaughterhouse-Five" by Kurt Vonnegut

ascertained

Example Sentences

Related Words