temperamental

[tem-per-uh-men-tl, -pruh-men-, -per-men-]
adjective
1.
having or exhibiting a strongly marked, individual temperament.
2.
moody, irritable, or sensitive: a temperamental artist.
3.
given to erratic behavior; unpredictable.
4.
of or pertaining to temperament; constitutional: temperamental differences.

Origin:
1640–50; temperament + -al1

temperamentally, adverb
nontemperamental, adjective
nontemperamentally, adverb
untemperamental, adjective
untemperamentally, adverb


2. excitable, volatile, emotional.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
temperamental (ˌtɛmpərəˈmɛntəl, -prəˈmɛntəl)
 
adj
1.  easily upset or irritated; excitable; volatile
2.  of, relating to, or caused by temperament
3.  informal working erratically and inconsistently; unreliable: a temperamental sewing machine
 
tempera'mentally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

temperamental
"of or pertaining to temperament," 1640s, from temperament; in the sense of "moody" it is recorded from 1907.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Natural motor proteins, unfortunately, are often temperamental.
New telescopes and satellites let scientists probe the secrets of the
  temperamental star.
Extremely temperamental connections sap the fun out of things.
Animation has its advantages: no temperamental stars, no expensive location
  shoots.
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