Synonyms of invalid

1 Syllable

null, mad, bad, wrong, sick, void

2 Syllables

falser, falsest, sicker, untrue, sickest, laid-up, unwell, madder, faulty, maddest, faultier, nuller, defunct, helpless, unsound, false

3 Syllables

erroneous, off-the-wall, sophistic, outpatient, fallacious, ill-founded, baseless, unbacked, basket-case, cooked-up, bedridden, unhealthy, reasonless

4 Syllables

unscientific, illogical, irrational, unreasoning, nugatory, unsanctioned, cockamamie, unratified, unreasoned

5 Syllables

unreasonable, hospitalized, unenforceable, unretentive

6 Syllables

illegitimate, inoperative

7 Syllables

misrepresentative