Altercation
(Noun) A heated argument
Ambivalent
(Adj.) to be uncertain; to be unable to decide between two opposing points of view
Amicable
(Adj.) friendly; peaceable
Anathema
(Noun) a greatly disliked, hated person or thing; a curse or a person cursed
Apathy
(Noun) lack of interest
Appease
(Verb) to make calm or quiet; to give in to the demands of
Arduous
(Adj.) difficult; requiring much effort; strenuous
Audacity
(Noun) insolence; rude boldness
Augment
(Verb) to enlarge; to increase in amount or intensity
Austere
(Adj.) stern, severe, plain