लक्ष्मण Lakshmana, अहम् I, क्रुद्धः am enraged, एकः alone, अयोध्यां च Ayodhya, पृथिवीं चापि and also the whole earth, इषुभिः with arrows, तरेयम् will cross, वीर्यम् prowess, अकारणं ननु without reason.
Once enraged, O Lakshmana I can overpower Ayodhya, even the whole world all by myself with my arrows. But exhibition of prowess without any reason is not desirable.