The sign for "weak" places the fingertips of the dominant hand on
the palm of the non-dominant hand and then bends the knuckles twice.
Since I'm right handed, my left hand stays still. My right hand moves
down, up, down.
Memory Aid:
Think of being "weak in the knees."
WEAK:




Tip: I do NOT recommend doing this sign on your forehead and then
pointing at your instructor nor your spouse.