in·sip·id 
(ĭn-sĭpĭd)
(ĭn-sĭpĭd)adj.
1. Lacking flavor or zest; not tasty: insipid soup.
2. Lacking qualities that excite, stimulate, or interest; dull.
[French insipide, from Late Latin īnsipidus : Latin in-, not; see IN-1 + Latin sapidus, savory (from sapere, to taste; see sep- in the Appendix of Indo-European roots).]
in′si·pidi·ty (ĭn′sĭ-pĭdĭ-tē), in·sipid·ness n.
in·sipid·ly adv.