In plain words
One who is equal toward enemy and friend, in honour and dishonour, in cold and heat, pleasure and pain, and who is free from attachment,
Word for word
Even toward foe and friend, and likewise in honour and dishonour, even in cold, heat, pleasure and pain, free from attachment,
समः शत्रौ च मित्रे च तथा मानापमानयोःशीतोष्णसुखदुःखेषु समः सङ्गविवर्जितः
Other commentaries
The commentators
▸Bhagavadgītābhāṣyam· bhāṣya
समः शत्रौ च मित्रे च, तथा मानापमानयोः पूजापरिभवयोः, शीतोष्णसुखदुःखेषु समः, सर्वत्र च सङ्गविवर्जितः ॥ १८ ॥
In plain words
Enemy or friend, he meets them the same way. Honor or insult, praise or contempt — he stands equally through all of it. Cold or heat, pleasure or pain — none of it tilts him one way or the other. And nowhere, in anything, does attachment take hold of him.
Close to the Sanskrit
Equal toward enemy and toward friend, likewise toward honor and dishonor, toward respect and contempt, equal amid cold and heat, pleasure and pain, and everywhere free of attachment.