insipid
adjective
[ ɪnˈsɪpɪd ]
• lacking flavour; weak or tasteless.
• "mugs of insipid coffee"
Similar:
tasteless,
flavourless,
unflavoured,
savourless,
bland,
weak,
thin,
watery,
watered-down,
unappetizing,
unpalatable,
wishy-washy,
wersh,
Origin:
early 17th century: from French insipide or late Latin insipidus, from in- ‘not’ + sapidus (see sapid).