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口が軽い [くちがかるい]

(See 口の軽い) (ant: 口が堅い) having a loose tongue/being talkative/speaking without thinking (Expressions (phrases, clauses, etc.), adjective (keiyoushi))

口の軽い [くちのかるい]

(See 口が軽い) loose-tongued/talkative (adjective (keiyoushi))