noun
a profane or obscene expression used to convey strong emotion or fill a sentence
adjective
relating to or serving as an expletive
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The speaker was reprimanded for using an expletive during the formal event.
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She let out an expletive when she realized she had forgotten her keys.
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He dropped an expletive when he stubbed his toe.
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The artist used expletives of color to create a vibrant painting.