i-adjective
gossipy; critical; foul-mouthed
Describes someone who habitually says unpleasant things about others, often in a meddlesome or sharp-tongued way. Carries a negative judgment of the speaker's character.
近所の口さがない人たちが、また噂をしている。
The gossipy neighbors are spreading rumors again.
彼は口さがないこと
He is known for being sharp-tongued and says harsh things to everyone.