adjective
an adjective describes or modifies a noun or pronoun, in this case 'abnormous' describes a noun by indicating it is unusually large or abnormal in size
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The scientist discovered an abnormous growth in the cell sample.
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That burger was abnormous, I could barely finish it!
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Her shoe collection is abnormous, she has a pair for every occasion.
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The impact of the pandemic on the economy was abnormous, causing widespread unemployment.