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Definition of foolishness : 1. A foolish practice; an absurdity.
2. The quality of being foolish.

Synonyms:

foolery, fury, betise, insaneness, indulgence, lyssa, fatuity, rabidity, rabidness, weakness, zaniness, rabies, incapacity, unwiseness, rage, lunacy, ability, hydrophobia, senselessness, imbecility, imprudence, indiscretion, insanity, tomfoolery, daftness, madness, flakiness

contradiction, silliness, absurdity, baloney, paradox, implausibility, incongruity, eccentricity, meaninglessness, folly, nonsense, bizarreness, impossibility, craziness, anachronism, inconsistency, inanity, irrationality, ludicrousness, outlandishness, invalidity, farce, preposterousness, balderdash, idiocy, self-contradiction

illiteracy, ignorance, simpleness, mindlessness

outrageousness, incredibility, ridiculousness, weirdness, grotesqueness, nonsensicality, dubiousness, curiosity

buffoonery, brainlessness, dottiness, goofiness, stupidity, asininity

Usage examples:

• I won't stand this foolishness forever. - "The Reclaimers", Margaret Hill McCarter.
• You are too young to start that kind of foolishness. - "A Daughter of the Land", Gene Stratton-Porter.
• Some customers wants the big ones on top; but I tell 'em it's all foolishness; just vanity. - "Annie Kilburn A Novel", W. D. Howells.