A person who accepts or will do anything; someone with no firm principles or standards; a pragmatist willing to adapt to any situation.
From 'anything' (any + thing, from Old English 'þing,' meaning object or matter) + '-arian' suffix (relating to or characterized by); a rare or archaic formation.
This word captures an idea that modern English struggles to name precisely—not a 'people-pleaser' or 'conformist,' but someone whose flexibility goes beyond adaptation into a kind of philosophical anything-goes attitude.
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