invalid

Synonyms: bad baseless fallacious false ill-founded illogical inoperative irrational mad not binding not working nugatory null null and void reasonless sophistic unreasonable unreasoned unscientific unsound untrue void wrong

Antonyms: sound valid worthwhile worthy

Synonyms: ailing bedridden below par debilitated disabled down feeble frail ill infirm laid low on the sick list out of action peaked poorly run-down sick weak

Antonyms: healthy well

Synonyms: consumptive convalescent incurable patient shut-in sufferer