The noun form of the adjective 'truculent' is truculence.
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John's truculent personality does not make it easy for him to
make friends.
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The word truculent is an adjective; the noun forms are
truculence and truculency.
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The word "truculent" can be a synonym for the word
"ill-tempered. " An example of the word "truculent" in a sentence
is "The cab driver had a truculent attitude in dealing with traffic
jam. "