1620, "without taste or perceptible flavor," from Fr.
insipide, from L.L.
inspidus "tasteless," from L.
in- "not" +
sapidus "tasty," from
sapere "have a taste" (also "be wise"). Fig. meaning "uninteresting, dull" first recorded 1649, but it was also a secondary sense in M.L.
"In ye coach ... went Mrs. Barlow, the King's mistress and mother to ye Duke of Monmouth, a browne, beautifull, bold, but insipid creature." [John Evelyn, diary, Aug. 18, 1649]