vapid
INSIPID implies a lack of sufficient taste or savor to please or interest. e.g. an insipid romance with platitudes on every page
e.g. an exciting story given a vapid treatment
FLAT applies to things that have lost their sparkle or zest. e.g. although well-regarded in its day, the novel now seems flat
JEJUNE suggests a lack of rewarding or satisfying substance. e.g. a jejune and gassy speech
BANAL stresses the complete absence of freshness, novelty, or immediacy. e.g. a banal tale of unrequited love
INANE implies a lack of any significant or convincing quality. e.g. an inane interpretation of the play
adjective
〈飲み物が〉無味の; 気の抜けた; 〈話・人などが〉生気のない, つまらない, 退屈な
e.g. tuneful but vapid musical comedies.
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ORIGIN