16 June 2012 (GPL site)

attenuate - reduce the signal strength

atypical - unusual

audacity - boldness
(syn. - bravery, impudence, brazenness, nerve)

augment - increase

avarice - greed
(syn. - covetousness , acquisitiveness)

avert - prevent

baleful - evil

balmy - mild

banal - meaning less, trite

baneful - poisonous