Sour or severe. an acrid or sour flavor. A fault in coffee
sometimes due to over heating. Like when you leave the glass
coffee pot on the heater and tste it a few hours later. A taste
fault in the coffee brew giving an acrid and sour sensation on
the tongue. The result of excessive heat after brewing which
stews the coffee. sour or bitter in taste harsh or corrosive in
tone; "an acerbic tone piercing otherwise flowery prose"; "a
barrage of acid comments"; "her acrid remarks make her many
enemies"; "bitter words"; "blistering criticism"; "caustic jokes
about political assassination, talk-show hosts and medical
ethics"; "a sulfurous denunciation" A term referring to a taste
fault in the coffee brew that leaves an acrid and sour sensation
on the tongue. is anything sour, bitter or sharp - cutting,
caustic, acid, mordant, barbed, prickly, biting, pointed. The
opposite flavor would be mild, sweet, or honeyed.