Synset
having no cogency or legal force
<adj.all>
invalid
sample sentences
"invalid reasoning"
"an invalid driver's license"
lexical pointers
antonym
valid
derivationally related form
invalidness
invalidity
semantic pointers
also see
illegitimate
similar to
bad, uncollectible
fallacious, unsound
false
spurious
invalidated, nullified
null, void
sophistic, sophistical