ACERB', adjective [Latin acerbus; G. herbe, harsh, sour, tart, bitter, rough, whence herbst autumn, herbstzeit, harvest time. See Harvest.] Sour, bitter, and harsh to the taste; sour, with astringency or roughness; a quality of unripe fruits.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI