General Adjectives:
* Aback: taken aback, surprised
* Abashed: embarrassed, ashamed
* Abhorrent: repulsive, detestable
* Abrupt: sudden, unexpected
* Absent: not present
* Abstract: theoretical, conceptual
* Abundant: plentiful, copious
* Abusive: insulting, offensive
* Academic: relating to education or scholarship
* Acceptable: satisfactory, suitable
* Accessible: reachable, easy to understand
* Accurate: correct, precise
* Acute: sharp, severe
* Adept: skilled, proficient
* Admirable: worthy of admiration
* Adorable: delightful, charming
* Adventurous: daring, risky
* Adverse: unfavorable, harmful
* Aesthetic: relating to beauty or art
* Affable: friendly, approachable
* Affectionate: loving, caring
* Afraid: fearful, scared
* Agreeable: pleasant, acceptable
* Alert: watchful, attentive
* Alive: living, existing
* Alleged: supposed, claimed
* Alluring: attractive, tempting
* Aloof: distant, uninterested
* Amazing: incredible, wonderful
* Ambitious: determined, goal-oriented
* Amiable: friendly, good-natured
* Ample: sufficient, plentiful
* Ancient: very old, historical
* Angry: furious, enraged
* Annoyed: irritated, upset
* Anxious: worried, uneasy
* Apathetic: indifferent, uninterested
* Apparent: obvious, clear
* Applicable: relevant, suitable
* Appropriate: suitable, fitting
* Arctic: relating to the Arctic region
* Aromatic: fragrant, pleasant-smelling
* Artificial: not natural, man-made
* Ashamed: embarrassed, guilty
* Assured: confident, certain
* Astonishing: amazing, incredible
* Astute: clever, perceptive
* Attractive: appealing, pleasing
* Audacious: bold, daring
* Authentic: genuine, real
* Automatic: self-acting, mechanical
* Available: accessible, obtainable
* Average: ordinary, typical
* Aware: conscious, knowledgeable
* Awful: terrible, dreadful
Descriptive Adjectives:
* Aching: painful, sore
* Acrid: bitter, pungent
* Airy: light, breezy
* Alert: watchful, attentive
* Aloof: distant, reserved
* Angelic: heavenly, pure
* Angry: furious, enraged
* Animated: lively, energetic
* Aromatic: fragrant, spicy
* Artistic: creative, talented
* Ashen: pale, gray
* Aspiring: ambitious, hopeful
* Awesome: impressive, awe-inspiring
* Awkward: clumsy, uncomfortable
Adjectives Related to Feelings:
* Afraid: fearful, scared
* Agitated: disturbed, anxious
* Angry: furious, enraged
* Anxious: worried, uneasy
* Apathetic: indifferent, uninterested
* Astonished: surprised, amazed
* Attracted: drawn to, interested in
* Aware: conscious, knowledgeable
* Awed: impressed, humbled
This is not an exhaustive list, but it gives you a good starting point for adjectives that begin with "A."