英语词源字典 - 在线词源网站

awesome (adj.)[awesome 词源字典]: 1590s, "profoundly reverential," from awe (n.) + -some (1). Meaning "inspiring awe" is from 1670s; weakened colloquial sense of "impressive, very good" is recorded by 1961 and was in vogue from after c. 1980. Related: Awesomely; awesomeness.[awesome etymology, awesome origin, 英语词源]
heart-felt (adj.): also heartfelt, "profoundly felt, deep, sincere," 1734, from heart (n.) + past tense of feel (v.).
profound (adj.): c. 1300, "characterized by intellectual depth," from Old French profund (12c., Modern French profond), from Latin profundus "deep, bottomless, vast," also "obscure; profound; immoderate," from pro- "forth" (see pro-) + fundus "bottom" (see fund (n.)). The literal and figurative senses both were in Latin, but English, having already deep, employed this word primarily in its figurative sense. Related: Profoundly.