Frivolous or superficial; describing behavior or attitudes that are shallow, flippant, or lacking seriousness or sincerity.
彼の軽薄な態度にみんなが失望した。
Everyone was disappointed by his frivolous attitude.
軽薄な発言は信頼を失う原因になる。
Frivolous remarks can cause a loss of trust.
彼女は表面的には明るいが、軽薄に見られがちだ。
Although she seems cheerful on the surface, she tends to be seen as frivolous.