adjective
adjective describes a noun or pronoun, in this case, 'tough' describes something that is strong, durable, or difficult to break or penetrate
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The tough decision had to be made by the board of directors.
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It's been a tough day at work, I could use a break.
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Dealing with that situation was really tough, but we managed to pull through.
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Life can be tough sometimes, but it's important to stay strong and keep moving forward.