casually; without any particular reason; nonchalantly
Used when someone does something in a casual, offhand manner, often without a specific purpose or deep thought. Implies a lack of formality or deliberation.
He casually walked into the room.
Don't say things like that so casually.
Phrase composed of 何か (something) + 無しに (without). The exact historical derivation is uncertain, but it functions as a set adverbial expression meaning 'without any particular thing' → 'casually'.