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clandestine
very secretive
assiduous
very diligent
destitute
very poor
incontrovertible
not open to question
exasperated
very irritated
euphoric
elated
adept
very skilled or proficient
immaterial
irrelevant; of no importance
despicable
derseving haterd or contempt
arduous
very difficult
ecstatic
very excited; overjoyed
emphatic
express something forcefully and clearly
contemplative
in deep thought
distraught
very distressed; very worried
trepidation
timid; great fear