temperamental

definition: 
subject to sharply varying moods; likely to perform unpredictably
sentence: 
At the best of times, the temperamental rains come for three or four months and turn dusty plains into green pastures, forests and fields.
"He can be temperamental, of course ... But when it comes to a crisis, he's the one who is most composed."
difficulty: 
very easy
toefl frequency: 
3
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