Sluttish comes from slut ('an untidy or slovenly woman'), of uncertain origin (Middle English slutte), plus the adjectival suffix -ish. The historical chain includes Middle English slutte. Older glosses in the chain include "an untidy or slovenly woman", which help explain the semantic range of the modern word. Morphologically, sluttish is best read as suffixal formation and uncertain formation, yielding an English adjective shaped by both form history and later usage. In current English it functions as an adjective, with the sense "slovenly or untidy; also promiscuous (archaic and derogatory)". English derivatives include sluttishly and sluttishness; related forms include slut and slutty. The result is an English adjective whose etymology preserves the older forms while supporting the word's specialized modern meaning.