enigmatic
adj.adj. mysterious and hard to understand. You might describe someone as enigmatic if they keep their thoughts secret and leave you guessing.
adj. difficult to interpret or understand; mysterious. Often used to describe people, expressions, or situations that conceal their true nature or meaning.
She gave an enigmatic smile and walked away without answering.
The new director remains an enigmatic figure, rarely speaking in meetings but clearly controlling the company's direction.
The painting's enduring appeal lies in the subject's enigmatic expression, which critics have debated for centuries without reaching a consensus on its true emotion.
From Latin aenigmaticus and French énigmatique, from Ancient Greek αἰνιγματικός (ainigmatikós); equivalent to enigma + -tic.
Typically used attributively before a noun or predicatively after a linking verb.