B.G 18.49
असक्तबुदि्धः सर्वत्र जितात्मा विगतस्पृहः। नैष्कर्म्यसिद्धिं परमां सन्न्यासेनाधिगच्छति ॥४९॥
A person with an unattached intellect, who is self-controlled and free from desires, achieves the highest perfection of performing actions without leaving undesired impressions through renunciation.
Gīta Bhāshya 18.49
'naiṣkarmyasiddhiṁ' - perfecting the way to do actions that does not leave undesirable imprints.
नैष्कर्म्यसिद्धिं नैष्कर्म्यफलां योगसिद्धिम् ॥४९॥
The term 'naiṣkarmyasiddhiṁ' means perfecting the Yoga of fruitless actions, i.e. perfecting the way to do actions that does not leave undesirable imprints.
Gīta Tātparya 18.49
'naiṣkarmyasiddhim' - perfection in the way to destroy all undesirable actions.
नैष्कर्म्यसिदि्धम् - अनिष्टसर्वकर्मनाशाख्यसिद्धिम् ॥४९॥
The term 'naiṣkarmyasiddhim' in the context means perfection in the way to destroy all undesirable actions.