wimp

Someone who lacks confidence or courage, is weak, ineffectual, irresolute and wishy-washy.

(see title)

To behave submissively.

"They were wimping along and I was accomplished," she asserts with some pride and a touch of arrogance.

To make (something) weak or wimpy.

If you're particularly fond of Foster's, Heineken or Moosehead at home, you will be disappointed to find that it's been wimped down for the American market.

Weak, wimpy.