Definition of unclement in English:
unclement
adjective (ˌ)ʌŋˈklɛm(ə)nt(ˌ)ʌnˈklɛm(ə)nt
Not clement; not merciful; cruel; (of the weather, a night, etc.) unpleasantly cold or wet.
Origin
Late 16th century; earliest use found in John Florio (1553–1625), author and teacher of languages. From un- + clement.