Bitterness defined.
Bitter: 1. Having a sharp pungent taste; not sweet; 2. Caused by or showing mental pain or resentment; 3. Painful or difficult to accept (DK Illustrated Oxford Dictionary)
Bitterness: pikria – acridity (especially poison), literally or figuratively (Strong’s)
A bitter person is a pickle puss (see Revelation 10:9-10).
Jason