unusually; contrary to one's habit
Used when someone's behavior or a situation deviates from the usual pattern. Often implies a surprising or notable departure from the norm.
He went home unusually early.
Unusually, today's meeting dragged on.
Kana spelling of に is also common.
Compound of 例 (rei, 'usual case') + に (ni, particle) + 無く (naku, adverbial form of 無い 'not exist'). Literally 'without precedent in one's usual case'.