INEXPLICABLY
inexplicably, curiously, oddly, peculiarly
(adverb) in a manner differing from the usual or expected; “had a curiously husky voice”; “he’s behaving rather peculiarly”
Source: WordNet® 3.1
Etymology
Adverb
inexplicably (comparative more inexplicably, superlative most inexplicably)
In an inexplicable manner; for an unknown reason.
Synonyms
• unexplainably
Source: Wiktionary
In*ex"pli*ca*bly, adv.
Definition: In an inexplicable manner.
INEXPLICABLE
In*ex"pli*ca*ble, a. Etym: [L. inexplicabilis: cf. F. inexplicable.
See In- not, and Explicable.]
Definition: Not explicable; not explainable; incapable of being explained,
interpreted, or accounted for; as, an inexplicable mystery. "An
inexplicable scratching." Cowper.
Their reason is disturbed; their views become vast and perplexed, to
others inexplicable, to themselves uncertain. Burke.
Source: Webster’s Unabridged Dictionary 1913 Edition