adjective
adjective describes a noun or pronoun, in this case 'tortuous' describes something full of twists and turns, complex or convoluted
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The tortuous path through the forest made it difficult to reach the other side.
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The tortuous route to the beach took us twice as long as we expected.
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That tortuous math problem was a real brain-buster.
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Her tortuous journey to self-discovery was filled with twists and turns.