Filled with fug; stuffy, warm, and uncomfortable from poor ventilation.
From 'fug' (noun) with past participle/adjectival -ed suffix. A British colloquialism describing the condition of a room or enclosed space.
Victorians used this constantly to complain about overcrowded drawing rooms and trains—it's the precise descriptor for that pre-modern suffering before air conditioning was invented.
Complete word intelligence in one call. Free tier — 50 lookups/day.