Synonyms of unsupported

unsupported

adjective

ˌən-sə-ˈpȯr-təd 

as in unreasonable

having no basis in reason or fact

an unsupported claim that the structure was built by Vikings

Synonyms & Similar Words

• unreasonable
• unsubstantiated
• invalid
• unfounded
• baseless
• unwarranted
• groundless
• false
• irrational
• unreasoned
• unnecessary
• misleading
• absurd
• illogical
• nonvalid
• inconsistent
• weak
• foundationless
• fallacious
• untenable
• wrong
• implausible
• unconvincing
• unsound
• unconscionable
• misled
• specious
• flimsy
• meaningless
• stupid
• gratuitous
• foolish
• uncalled-for
• silly
• nonsensical
• nonlogical
• fatuous
• unwise
• asinine
• insane
• ill-advised
• preposterous
• wacky
• simpleminded
• harebrained
• nutty
• mad
• senseless
• brainless
• crackpot
• crazy
• half-witted

Antonyms & Near Antonyms

• valid
• reasonable
• hard
• good
• justified
• reasoned
• just
• certified
• confirmed
• substantiated
• logical
• well-founded
• rational
• actual
• validated
• true
• informed
• well-grounded
• real
• certain
• sensible
• wise
• sane
• genuine
• corroborated
• sober
• verified
• solid
• clear
• plausible
• sure
• sound
• credible
• compelling
• convincing
• persuasive
• commonsense
• satisfying
• cogent

Example Sentences

Recent Examples of unsupported

The lawsuit filed by two former employees contains allegations that are false, misleading, and unsupported by credible evidence. — Devon Henderson, New York Times, 2 Sep. 2026

The lawsuit says the decision was unlawful, unsupported by facts and inconsistent with the military’s past praise of Claude. — Reuters, NBC news, 28 Aug. 2026

My office will scrutinize rate increases, challenge unsupported or unfair costs, ensure our climate priorities are met and demand transparency about how Rhode Island Energy spends customers’ money. — Katie Mulvaney, The Providence Journal, 25 Aug. 2026

The feedback is often vague, unsupported by concrete examples and disconnected from anything the employee could have reasonably corrected earlier. — Lauren Russell, Forbes.com, 18 Aug. 2026