Adverb
in an unaccountable manner
Source: WordNetin the book, a tycoon unaccountably becomes the hero's friend Source: Internet
Maxwell observed that the specific heat capacity of H 2 unaccountably departs from that of a diatomic gas below room temperature and begins to increasingly resemble that of a monatomic gas at cryogenic temperatures. Source: Internet
Gould incurred some controversy when he had Tracy live in an unaccountably ostentatious manner on a police officer's salary, and responded with a story wherein Tracy was accused of corruption and had to explain the origin of his possessions in detail. Source: Internet
Such is a correct description as it was in 1841, of Williams‘ slave pen in Washington, in one of the cellars of which I found myself so unaccountably confined." Source: Internet
Not unaccountably, Platina, in his Vitae pontificum, set forth an unfavorable delineation of the character of Paul II. Source: Internet
When I bought the Steam version of in a fit of nostalgia, I found that the 17-year-old game first released in the arcade and on the Dreamcast was unaccountably hard to control. Source: Internet