the compound adjective 'still-hot' is a transparent formation from two native english elements. 'still' derives from proto-germanic stillijaz, related to the concept of fixedness or quiet, which evolved to convey temporal continuity—the sense of something 'remaining' in a state. 'hot' originates from proto-germanic haitaz, a term for heat, with a clear lineage to proto-indo-european kay- (to heat). the logic of the compound is straightforwardly descriptive: it combines the enduring quality of 'still' with the thermal property of 'hot' to denote an object that retains its heat or, metaphorically, a situation that retains its intensity over time.

Structure: still (sense) + hot (sense) still: from old english stille (motionless, at rest, quiet); functions as an adverb/adjective meaning 'continuing, remaining'. hot: from old english hāt (having a high temperature, burning); functions as an adjective meaning 'having a high temperature'.