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temperamental (adjective)
A temperamental person is someone whose mood changes frequently and unpredictably. It can also describe machines or systems that do not work consistently and are difficult to manage.
Think of a 'Temper' that is 'Mental' (crazy). A temperamental person has a temper that is unpredictable and mental.
Using 'tempermental' instead of 'temperamental'. → temperamental
Saying 'The temperature is temperamental'. → The temperature is fluctuating.
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