Amateur – Lacking professional skill or expertise.
Antagonist – One that opposes other.
Amnesia – Partial or total loss of memory.
Analgesia – The loss of ability to feel pain while still conscious.
Apostate – One who abandons his religious faith.
Brittle – Things which are easily broken.
Biography – The life history of a man written by someone else.
Bilingual – One who can speak two languages.
Bellicose – A person who is fond of fighting.
Boorish – Person who is rough and ill mannered.