sharp and harsh taste or odor; deeply or violently bitter

 stubbornly persistent in wrongdoing; hardened in feelings

a set belief or principle

lacking strength or permanence

to laugh boisterously

using or involving the use of a minimum of words; concise to the point of seeming rude or mysterious 

to make poisonous, to cause bitterness and bad feeling

 Cancel, deny, appeal, suppress

the presence of something only in small or insufficient quantities or amounts; scarcity.