In top form and Stiff-necked

Stiff-necked and in top form are semantically related. In some cases you can use "Stiff-necked" instead an adjective phrase "In top form".

Stiff-necked adjective - Having a feeling of superiority that shows itself in an overbearing attitude.

In top form and stiff-necked are semantically related. Sometimes you can use "In top form" instead an adjective phrase "Stiff-necked".