अन्वयः

मृथे in vain, रामरावणयोः both Rama's and Ravana's, तथा like that, बाणान् arrows, विसृजतोः let go, अनिमित्तः failed to reach the target, बाणः arrow, न अभवत् not become, अनिर्भेत्ता no arrow failed to complete the target, न not, निष्फलः without result, न not, अन्योन्यम् one another, अभिसम्हत्य colliding with each other, धरणीतले on the ground, निपेतुः fell

M N Dutt

None (of the arrows) missed the aim, none of them failed to pierce another and none of them was fruitless. And the arrows discharged by Rāma and Rāvana striking each other fell down on the earth.

Summary

The arrows released by both Rama and Ravana were without result. None failed to reach the target. None failed to complete the target. The arrows were colliding with one another and fell on the ground.

पदच्छेदः

नानिमित्तो	न (अव्ययः)–अनिमित्त (१.१)
ऽभवद्	अभवत् (√भू लङ् प्र.पु. एक.)
बाणो	बाण (१.१)
नातिभेत्ता	न (अव्ययः)–अति (अव्ययः)–भेत्तृ (१.१)
न	न (अव्ययः)
निष्फलः	निष्फल (१.१)
तथा	तथा (अव्ययः)
विसृजतोर्	विसृजत् (√वि-सृज् + शतृ, ६.२)
बाणान्	बाण (२.३)
रामरावणयोर्	राम–रावण (६.२)
मृधे	मृध (७.१)

छन्दः

अनुष्टुप् [८]

छन्दोविश्लेषणम्

१	२	३	४	५	६	७	८
ना	नि	मि	त्तो	ऽभ	व	द्बा	णो
ना	ति	भे	त्ता	न	नि	ष्फ	लः
त	था	वि	सृ	ज	तो	र्बा	णा
न्रा	म	रा	व	ण	यो	र्मृ	धे