Added 9 October 2026 monkeyism noun Categories: Obscure Words noun ! Definition from Wiktionary (CC BY-SA). More about monkeyism at Wordnik → Where our words come from → Tomfoolery; silly or foolish behaviour. The Darwinian theory of evolution. Origin From monkey + -ism. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: tomfooleryfoolerytomfuckerydonkeyismfoolingfoolishnessjackassismfoolishmentidiotismnincompooperysillyism Back to today's word