na-adjective, noun
thoughtless; flighty; frivolous
Describes a person or behavior that is impulsive, lacking in seriousness, or easily distracted. Often used in literary or formal contexts.
彼の軽躁な態度が会議の進行を妨げた。
His thoughtless attitude disrupted the progress of the meeting.
軽躁な発言は避けるべきだ。
You should avoid frivolous remarks.
Compound of 軽 (light, frivolous) and 躁 (restless, impetuous). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning of thoughtlessness or flightiness.