adjective
adjective describes a quality or attribute of a noun, in this case, 'thorough' describes something done with great attention to detail or completeness
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The investigator conducted a thorough examination of the crime scene.
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Make sure to do a thorough check before submitting your assignment.
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I did a thorough clean-up of my room before my parents came home.
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She gave a thorough explanation of the complex topic, making it easy to understand.