ضِدّ opposite, contrary, contrast, counter, reverse, converse; adversary, antagonist, opponent; antonym; against, opposed to; versus; anti-, counter-, counteracting, contra-; -proof

ضِدّ الحَرِيقِ أو النّار fireproof

ضِدّ الرّصَاص bulletproof

ضِدّ المَاء waterproof

الضّدّ يُظْهِرُ حُسْنَهُ الضّدّ nothing is good or ill but by comparison