Of heat, weather, etc.: Oppressively hot, sweltering, sultry.

Of the weather, the atmosphere, etc.: Oppressively hot and moist; sweltering.

Of heat, weather, a season, etc.: Oppressive or overpowering with great heat; causing or accompanied by profuse sweating or suffocation through…

Of the weather: warm, sultry, close. Of a person: exhausted by heat. Cf. moothy, adj.