VAPID

Flat

• Bland

• Brainless

• Dull

• Dull as dishwater

• Flavorless

• Hardly stimulating

• Having zero zip

• Insipid

• Lacking life

• Lacking liveliness

• Lacking sharpness

• Lacking spirit

• Lacking tang

• Lacking zest

• Lifeless

• Not very interesting

• Prosaic

• Spiritless

• Unanimated

• Uninspired

• Uninspiring

• Uninteresting

• Very uninteresting

• Watered down

• Wishy-washy