Astute
Shrewd
Athesis
one who denies existence of god
Atrophy
to waste away
Attest
to confirm
audacious
bold
Augment
to increase
Augur
To predict
August
majestic: imposing
Auspices
protection
Auspicious
favorable
austerity
severity
Autocratic
arrogant
Autonomy
self-government
Avarice
greed
Badger
to harass; to nag
Banal
meaningless; commonplace
Bellicose
warelike
benignant
kindly; gentle
Bicker
to quarrel
biennial
occurring every two years
Bland
mild
Blatant
objectionably
Blithe
carefree
Bluster
to speak boastfully
Botch
to ruin through clumsiness
Bourgeois
pertaining to the middle class
Broach
to introduce a topic
Brusque
abrupt in manner
Buffoon
clown
Burnish
to polish