निमित्तानि च पश्यामि विपरीतानि केशव। न च श्रेयोऽनुपश्यामि हत्वा स्वजनमाहवे ॥

nimittāni cha paśhyāmi viparītāni keśhava na cha śhreyo ’nupaśhyāmi hatvā sva-janam āhave

And I see adverse omens, O Keshava. Nor do I foresee any advantage from slaying kinsmen in battle.

In plain words: Arjuna says he sees bad signs. He cannot see any good coming from killing his own family in battle. Keshava is a name for Krishna.