忝
テン, かたじけな.い

grateful, indebted

JLPT0 G13 S0 F5000

As per 天# (top of) the head + 心 heart/emotions → shame/disgrace figuratively attached to a person's head → *put to shame*; *disgraced*. Also, *thankful*, *grateful*, and *appreciate* (← thankful/grateful/appreciative, though ashamed at receiving help).

[Full Kanji Etymology List]