1. Lacking flavour 
2. Lacking aesthetic or social taste

See also: appreciation, barbaric, bland, brassy, Brummagem [Brit], camp, campy, cheap, discernment, flash, flashy, flat, flavorless [US], flavourless [Brit, Cdn], garish, gaudy, gimcrack, indelicate, inelegant, insipid, kitsch, kitschy, loud, meretricious, nonflavored [US], nonflavoured [Brit, Cdn], off-color [US], off-colour [Brit, Cdn], ostentatious, perceptiveness, pretentious, savorless [US], savourless [Brit, Cdn], schlocky, tacky, taste, taste property, tastelessly, tastelessness, tatty, tawdry, trashy, unappetising [Brit], unappetizing, unflavored [US], unflavoured [Brit, Cdn], unpalatable, unsalted, unseasoned, vapid

Antonym: tasteful, tasty

• unsusceptibility
• unsusceptible
• unsuspected
• unsuspecting
• unsuspectingly
• unsuspicious
• unsustainable
• unswayed
• unsweet
• unsweetened
• unswept
• unswerving
• unswervingly
• unsworn
• unsyllabic
• unsyllabled
• unsymbolic
• unsymmetric
• unsymmetrical
• unsymmetrically
• unsympathetic
• unsympathetically
• unsympathising
• unsympathizing
• unsynchronised