Aflutter and Weak-kneed

Aflutter adjective - Feeling or showing uncomfortable feelings of uncertainty.

Weak-kneed and aflutter are semantically related in alarmed topic. In some cases you can use "Weak-kneed" instead an adjective "Aflutter".

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

Aflutter and weak-kneed are semantically related in alarmed topic. Sometimes you can use "Aflutter" instead an adjective phrase "Weak-kneed".