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

In internal testing, Carbon reduced unsupported claims by approximately half compared with Argon. — Neetika Walter, Interesting Engineering, 28 Oct. 2026

Nvidia has gone to great lengths to secure support from game publishers, but many titles remain unsupported at the time of writing. — Joe Osborne, PC Magazine, 17 Oct. 2026

This case involved a restaurant owner accused of underreporting more than US$2 million in business receipts and claiming unsupported depreciation deductions on rental properties. — Kaitlin Newkirk, The Conversation, 14 Oct. 2026

But Kelly agreed with the plaintiffs that the national security arguments came after the fact and were unsupported by the administration. — ABC News, 13 Oct. 2026