weak-kneed

Lacking resolve; easily swayed or frightened. You can definitely get someone weak-kneed like Tim to do this stupid project for you. You'll never convince them to give you a raise if you go into the meeting weak-kneed.

See also:

frighten
be frightened to death
be scared to death
scared to death
be not for the faint-hearted
I wasn't brought up in the woods to be scared by owls
a man who stands for nothing will fall for anything
get the wind up (one)
scare
frighten the (living) daylights out of (someone)

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