Abate
To lessen or reduce in intensity.
Abstract
Existing in thought or as an idea but not having a physical or concrete existence.
Abysmal
Extremely bad or appalling.
Agitate
To disturb or upset someone often causing them to become anxious or nervous.
Adversarial
Involving conflict or opposition.
Aloof
Distant or detached, either emotionally or physically.
Ambiguous
Open to more than one interpretation; unclear or uncertain.
Apathy
Lack of interest, enthusiasm, or concern.
Apprehensive
Anxious or fearful that something bad might happen.
Arduous
Involving or requiring strenuous effort; difficult and tiring.