Enigmatic

The Mona Lisa has an enigmatic smile.

Enigmatic mining billionaire Clive Palmer has just been elected to the Australian parliament, with one of the smallest margins in history.

As I glanced up from reading this enigmatic message, I saw Holmes chuckling at the expression upon my face.

Mary is enigmatic.

Tom is enigmatic.

She's a strange, enigmatic and inspiring poet.

Although the Hubble results are exciting, the researchers say they need more observations to develop a more definitive picture of these enigmatic flashes and better pinpoint their source.

Materialists explain the origin of the universe and life by attributing everything to the enigmatic explosion of an unbelievable singularity.

I like her enigmatic humour.

Scarcely more than half the stature of their predecessors, these beings were proportionally slight and lithe. Their skin was of a sunny brown, covered with a luminous halo of red-gold hairs, which on the head became a russet mop. Their golden eyes, reminiscent of the snake, were more enigmatic than profound. Their faces were compact as a cat's muzzle, their lips full, but subtle at the corners. Their ears, objects of personal pride and of sexual admiration, were extremely variable both in individuals and races. These surprising organs, which would have seemed merely ludicrous to the First Men, were expressive both of temperament and passing mood. They were immense, delicately involuted, of a silken texture, and very mobile. They gave an almost bat-like character to the otherwise somewhat feline heads. But the most distinctive feature of the Third Men was their great lean hands, on which were six versatile fingers, six antennae of living steel.