enigma

the word 'enigma' entered english in the late 16th century via latin, originating from the greek word 'ainigma', meaning 'riddle' or 'dark saying'. this greek term derives from the verb 'ainissesthai', which means 'to speak allusively' or 'to hint at', itself coming from 'ainos', a tale or fable. the core semantic thread from its ancient origins to modern usage is the concept of an obscure, allegorical, or deliberately puzzling form of communication, evolving from a specific type of riddle to describe anything profoundly mysterious.

the word is a simplex loanword from latin, which itself borrowed it from greek. it is not productively segmented into meaningful subparts in modern english spelling.