Taciturn
inclined to silence; reserved in speech; reluctant to joinin conversation.
Mercurial
changeable;volatile; fickle; flighty; erratic: a mercurial nature.
Succint
brief and to the point
perfunctory
casual: hasty and without attention to detail; not thorough
lugubrious
excessively mournful
sohpistry
a deliberately invalid argument displaying ingenuity inreasoning in the hope of deceiving someone
diffident
lacking self confidence
protract
prolong, lengthen in time
misanthrope
someone who dislikes people in general
tendentious
Having a tendency
sedulous
diligence, persistance
Insolent
arrogant conduct, bold behavior or attitude
Aggrandize
To make great; to enlarge; to increase
Indolent
Habitually lazy, procrastinating, or resistant to physicallabor/labour
Imperious
Domineering, arrogant, or overbearing
Deluge
To fill quickly beyond capacity
Arbitrary
based on or subject to individual discretion or preferenceor sometimes impulse or caprice; random
abnegate
deny: deny oneself (something); restrain,
relegate
refer to another person for decision or judgment
attenuate
become weaker, in strength, value, or magnitude
ineluctable
impossible to avoid or evade
exacerbate
worsen
Efficacy
Capacity or power to produce a desired effect
extant
still in existance
insular
narrow-minded