Groggy and Weak knees

Groggy adjective - Stunned or confused and slow to react (as from blows or drunkenness or exhaustion).

Weak knees and groggy are semantically related In some cases you can use "Weak knees" instead an adjective "Groggy".

Groggy and weak knees are semantically related in dazed topic. You can use "Groggy" instead an adjective phrase "Weak knees", if it concerns topics such as dizzy, light-headed.