thuh

thu̍h (C. tho̍h).
thu̍h-thu̍h, naturally stupid looking and wanting in animation; very dull, quiet, and reserved in manner, not seeming to understand or take any interest in what we say.
thu̍h-thu̍h náⁿ hàu-lâm, looking as dull and spiritless as a man in deepest mourning for his parent.