Words Steel and Unnerve are semantically related or have opposite

How are the words Steel and Unnerve related? Steel and Unnerve are antonymous, they have opposite meaning.

edX/MITx 6.00x Introduction to Computer Science and Programming/ProblemSet3/ words.txt at master · ConAntonakos/edX · GitHub

newspeak/wordsByFrequency.txt at master · newspeaklanguage/newspeak · GitHub

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