sleekishadj.

/ˈsliːkɪʃ/Etymology: < sleek adj. and adv. + -ish suffix1.
the world > animals > animal body > general parts > covering or skin > [adjective] > having a coat > glossy
1850 Nov. 265 Drawn by a pair of sleekish horses.
This entry has not yet been fully updated (first published 1911; most recently modified version published online March 2018).