vapid

Short definition from Wiktionary

Adjective

1. 1
   Offering nothing that is stimulating or challenging.
2. 2
   Lifeless, dull, or banal.
3. 3
   Tasteless, bland, or insipid.
4. 4
   An acronym for remembering undesirable characteristics for goal-setting: vague, amorphous, pie-in-the-sky, irrelevant, delayed/disassociated.