- imponderable (adj.)
[imponderable 词源字典]
- 1794, "weightless," from assimilated form of in- (1) "not, opposite of" + ponderable (see ponder). Figurative use, "unthinkable," from 1814. Related: Imponderably. As a noun, by 1842.[imponderable etymology, imponderable origin, 英语词源]