2:36  

अवाच्यवादांश्च बहून्वदिष्यन्ति तवाहिताः ।
निन्दन्तस्तव सामर्थ्यं ततो दुःखतरं नु किम् ॥२- ३६॥

awaachyawaadaaMshcha bahoonwadiShyanti tawaahitaaH ।

nindantastawa saamarthyaM tato duHkhataraM nu kim ॥२- ३६॥

Source: Automatic ITRANS Transliteration

Many unspeakable things will your enemies speak of you,
Defame your ability. Is there any greater suffering than that?

Source: Milind S. Pandit

Your enemies will speak many unmentionable words and scorn your ability. What could be more painful than this?

Source: The Bhagavad-Gita: The Sacred Song

Your enemies will describe you in many unkind words and scorn your ability. What could be more painful for you?

Source: Bhagavad Gita As It Is