Question

what is the vilom of Krishna
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Answer 1

Explanation:

We have two recensions of yajurveda called Krishna-Yajurveda कृष्ण-यजुर्वेद and Shukla-Yajurveda शुक्ल-यजुर्वेद. The waning fortnight is called Krishna-paksha कृष्ण-पक्ष while it's waxing counterpart is Shukla-paksha शुक्ल-पक्ष. So I suppose Shukla शुक्ल (meaning: bright) is the opposite of the word Krishna.