This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. comparative form of sleek: more sleek

n. In leather manufacturing, a tool of steel or glass in a wooden stock, used with pressure to dress the surface of leather, in order to remove inequalities and give a polish.

n. In founding, a small tool, usually of brass, made in a variety of shapes, used to smooth the curved surfaces of molds.

n. An oilskin or water-proof overcoat.

n. See boss-tool.

"I don't mind the idea of sleeker but jets and tanks don't get "sleeker"."

brass sleeker   

Speaker    beaker    bleaker    leaker    meaker   

watermarking    lancers    itouch    billycock    steepy