Easily swayed and Weak-kneed

Weak-kneed and easily swayed are semantically related. In some cases you can use "Weak-kneed" instead an adjective phrase "Easily swayed".

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

Easily swayed and weak-kneed are semantically related. Sometimes you can replace phrase "Easily swayed" with "Weak-kneed", this phrases are similar.