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arbitrary
based on individual discretion or random choice rather than any reason or system
brooding
showing deep unhappiness of thought; appearing deep in thought; often giving a sense of gloom
brusque
blunt in manner of speech often to the point of ungracious harshness
capricious
given to sudden and unaccountable changes of mood or behavior; unpredictable
denigrating
criticizing or defaming someone or something; disparaging
ephemreral
lasting for a very short time; transient; fleeting
laudatory
expressing praise and commendation; complimetnary
obstreperous
noisy and difficult to control; unruly
omniscient
having complete or unlimited knowledge; knowing everything
pensive
engaged in, involving, or reflecting deep or serious thought
senile
exhibiting the mental and physical decline associated with old age
zealous
showing great energy or enthusiasm in pursuit of a cause or objective