Weak at the knees and Weak-kneed

Weak-kneed and weak at the knees are semantically related. In some cases you can use "Weak-kneed" instead an adjective phrase "Weak at the knees".

Weak-kneed adjective - Lacking strength of will or character.

Weak at the knees and weak-kneed are semantically related. You can use "Weak at the knees" instead an adjective phrase "Weak-kneed".