something that detracts from perfection: a fault, a flaw, a defect / a disadvantage, a drawback / a failing grade

(dated) flavourless, savourless (UK)/flavorless, savorless (US), bland, flat, insipid, vapid / boring, useless / unbearable, disgusting / (dated) dreary, drab, wearisome

blowfish.

(historical) a vassal, (particularly) a vassal of low rank within the feudal state of a lord / (historical) a samurai directly loyal to the shogun