austere - Strictly simple and plain without decoration
apocalypse - A dramatic event resulting in great destruction and change
avalanche - A mass of snow, ice, and/or rocks that fall rapidly down a mountainside.
articulate - The ability to express yourself clearly and effectively.
astute - Ability to understand things quickly and clearly, and to use the knowledge well
annihilate - To totally destroy
asinine - Very stupid or silly
ample - Plentiful, more than enough
astound - To cause others to be very surprised or shocked
antics - Funny, silly, or strange behavior
animosity - A strong feeling of dislike or hatred
appease - To give into demands to stop or avoid conflict