nonvalid
adjective
non·val·id ˌnän-ˈva-ləd 
: not valid : invalid
nonvalid arguments
a nonvalid license
nonvalidity
ˌnän-və-ˈli-də-tē
noun -va-
the nonvalidity of the allegations
Synonyms
- baseless
- foundationless
- groundless
- invalid
- unfounded
- unreasonable
- unsubstantiated
- unsupported
- unwarranted
See all Synonyms & Antonyms 
Word History
First Known Use
1803, in the meaning defined above
nonvalid
adjective
1
as in unreasonable
having no basis in reason or fact a nonvalid theory that most scientists rejected long ago Synonyms & Similar Words
Relevance
- unreasonable
- invalid
- unsupported
- false
- irrational
- unwarranted
- baseless
- unfounded
- unsubstantiated
- misled
- absurd
- misleading
- unnecessary
- weak
- wrong
- unreasoned
- inconsistent
- groundless
- illogical
- unconscionable
- stupid
- untenable
- implausible
- fallacious
- unconvincing
- gratuitous
- nonlogical
- specious
- foundationless
- insane
- silly
- unsound
- flimsy
- foolish
- meaningless
- mad
- unwise
- whacky
- lunatic
- wacky
- nutty
- fatuous
- simpleminded
- asinine
- preposterous
- ill-advised
- crazy
- harebrained
- nonsensical
- brainless
- senseless
- uncalled-for
- crackpot
- half-witted
Antonyms & Near Antonyms
- valid
- good
- reasonable
- hard
- justified
- just
- confirmed
- validated
- reasoned
- certified
- true
- informed
- wise
- logical
- sensible
- real
- certain
- actual
- corroborated
- sane
- verified
- substantiated
- genuine
- well-grounded
- sober
- sure
- rational
- solid
- clear
- well-founded
- satisfying
- plausible
- compelling
- convincing
- persuasive
- commonsense
- credible
- cogent
- sound
2
as in invalid
having no legal or binding force failure to inform the suspect of his rights rendered his confession nonvalid Synonyms & Similar Words
- invalid
- null
- void
- null and void
- illegal
- inoperative
- bad
- nonbinding
- nugatory
- worthless
- useless
- ineffective
- ineffectual
Antonyms & Near Antonyms
- good
- valid
- legal
- binding
- working