Nonentity
Part of speech: noun
Definition: an unimportant or insignificant person the state of not existing; nonexistence
Nothing
Part of speech: adverb
Definition: Not at all; in no way.
Part of speech: pronoun
Definition: Not any thing; no thing.An absence of anything, including empty space, brightness, darkness, matter, or a vacuum.AnythingSomething trifling, or of no consequence.
Example sentence: Of all men's miseries the bitterest is this: to know so much and to have control over nothing.