enigmas

enigma e*nig"ma ([-e]*n[i^]g"m[.a]), n.; pl. {enigmas} ([-e]*n[i^]g"m[.a]z). [L. aenigma, Gr. a'i`nigma, fr. a'ini`ssesqai to speak darkly, fr. a'i^nos tale, fable.] 1. A dark, obscure, or inexplicable saying; a riddle; a statement, the hidden meaning of which is to be discovered or guessed. [1913 Webster]

A custom was among the ancients of proposing an enigma at festivals. --Pope. [1913 Webster]

2. An action, mode of action, or thing, which cannot be satisfactorily explained; a puzzle; as, his conduct is an enigma.