adjective, sleek·i·er, sleek·i·est. sleek; smooth.

Is sleekly a word?

Meaning of sleekly in English. (especially of hair) in a way that is smooth, soft, and shiny: She combed out her hair until it glowed sleekly. Irene looked less sleekly groomed than usual.

Is it sleek or Sleak?

Sleek always means smooth, glossy, and streamlined. Sleek is a variant of the word, slick. When you slick back your hair with grease, it becomes sleek. Cats are often called sleek with their silky coats and lithe movements.