Adjective flat, dull
Synonyms: bland, boring, colorless, dead, driveling, flat tire, flavorless, inane, innocuous, insipid, jejune, least, lifeless, limp, milk-and-water, milquetoast, nothing, nowhere, stale, tame, tasteless, tedious, tiresome, unimaginative, uninspiring, uninteresting, unpalatable, vacant, vacuous, watery, weak, wishy-washy, zero
Antonyms: lively, pungent, sharp, spicy, strong