BDB3980
אַכְזָב adjective deceptive, disappointing (elative; opposed to אֵיתָן q. v. below יתן) — only absolute singular: — Mic 1:14 (with play on proper name אַכְזִיב ); of a deceptive, disappointing stream (compare Isa 58:11) Jer 15:18 (|| מַיִם לֹא נֶאְמָ֑נוּ; on meaning compare Job 6:15 ff.)