Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun null

1 sense of null

Sense 1
nothing, nil, nix, nada, null, aught, cipher, cypher, goose egg, naught, zero, zilch, zip, zippo -- (a quantity of no importance; "it looked like nothing I had ever seen before"; "reduced to nil all the work we had done"; "we racked up a pathetic goose egg"; "it was all for naught"; "I didn't hear zilch about it")
       => relative quantity -- (a quantity relative to some purpose)

Antonyms of adj null

1 sense of null

Sense 1
null, void -- (lacking any legal or binding force; "null and void")

INDIRECT (VIA invalid) -> valid -- (well grounded in logic or truth or having legal force; "a valid inference"; "a valid argument"; "a valid contract")

Similarity of adj null

1 sense of null

Sense 1
null, void -- (lacking any legal or binding force; "null and void")
       => invalid (vs. valid) -- (having no cogency or legal force; "invalid reasoning"; "an invalid driver's license")