IPA: /dɛˈklæs/
KK: /dɛˈklæs/
Having a lower social status or rank than before; considered to be of inferior quality or position.
After losing his job, he felt declasse among his former friends.
Declasse is derived from the French word 'déclassé', which comes from 'dé-' (meaning down or away) and 'classer' (meaning to classify). The term originally referred to someone who has fallen from their social class or status, indicating a downward movement in classification.
Think of someone who has moved 'down' ('dé-') in their social 'class' ('classer') — that's why declasse refers to someone who has lost their social status.