I was angry with my friend: I told my wrath, my wrath did end. I was angry with my foe: I told it not, my wrath did grow. ~ William Blake
repressed
pent-up
stifled
bitter
begrudging
resentful
envy
jealousy
spite
scheme
action
danger
Anger is an acid that can do more harm to the vessel in which it is stored than to anything on which it is poured. ―