What are the opposite words for invalidity?

The antonyms of the word "invalidity" mostly comprise words that reflect the opposite meaning of the term. The opposite of the term invalidity is validity, which refers to the state of being valid, legally or factually sound, rational, and reasonable. Terms such as reliability, authenticity, effectuality, and veracity can also be used as antonyms for invalidity. Furthermore, concepts like correctness, coherence, consistency, and substance make up the antonyms of invalidity. Conversely, synonyms for invalidity include nullity, ineffectiveness, and inefficacy. Using antonyms in written or spoken communication allows the writer or speaker to convey a more precise and nuanced idea.

Antonym of the day

adversary, antagonist, boss.