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temperamental

tem·per·a·men·tal

temperamental

 
pronunciation:
tem p r men tl [or] tem pr men tl
part of speech: adjective
definition 1: overly excitable or irritable.
synonyms:
difficult, excitable, high-strung, hotheaded, mercurial, short-tempered, tempestuous, touchy
antonyms:
equable, placid
similar words:
capricious, emotional, explosive, fiery, moody, nervous, peppery, thin-skinned, turbulent, volatile
definition 2: changeable as to mood, nature, operability, or the like; unpredictable.
The weather is temperamental in the early spring; we may have snow one day and warm air and sunshine the next.It's a temperamental engine and it may take a few tries to start it.
synonyms:
capricious, changeable, unpredictable, unstable, variable
antonyms:
steady
similar words:
fickle, impulsive, inconstant, mercurial, moody, rash, reckless, undependable, unreliable, volatile, whimsical
definition 3: of, concerning, or caused by temperament.
his temperamental suitability for the job
synonyms:
congenital, constitutional, inborn, inherent, innate, intrinsic
similar words:
deep-rooted, ingrained
derivation: temperamentally (adv.)