The word(s) "keen" appears 3 time(s) in 3 verse(s) in Quran in Muhammad Pickthal translation.

(1) Say: Allah is Best Aware how long they tarried. His is the Invisible of the heavens and the earth. How clear of sight is He and keen of hearing! They have no protecting friend beside Him, and He maketh none to share in His government.

(2) And (the tribes of) A'ad and Thamud! (Their fate) is manifest unto you from their (ruined and deserted) dwellings. Satan made their deeds seem fair unto them and so debarred them from the Way, though they were keen observers.

(3) Lo! the vigil of the night is (a time) when impression is more keen and speech more certain.