难堪 (nán kān): Intolerable (Adjective) — Meaning & Stroke Order

He fell down and felt very embarrassed.

Saying the wrong thing in front of everyone made him feel embarrassed and awkward.

He has never felt the slightest bit ashamed of his background.

Having to maintain dignity while enduring this unbearable situation has left him utterly exhausted.

Facing the boss's harsh criticism, he felt extremely embarrassed and wished he could disappear into the ground.

Don't make everyone feel so awkward over such a trivial matter; just apologize.