18:25  

अनुबन्धं क्षयं हिंसामनवेक्ष्य च पौरुषम् ।
मोहादारभ्यते कर्म यत्तत्तामसमुच्यते ॥१८- २५॥

anubandhaM kShayaM hiMsaamanawekShya cha pauruSham ।

mohaadaarabhyate karma yattattaamasamuchyate ॥१८- २५॥

Source: Automatic ITRANS Transliteration

Regardless of consequences, loss, or injury to persons,
Action initiated from delusion, that is called tamas.

Source: Milind S. Pandit

Action that is undertaken because of delusion; disregarding consequences, loss or injury to others, as well as one's own ability is said to be Taamasika action.

Source: The Bhagavad-Gita: The Sacred Song

And that action performed in ignorance and delusion without consideration of future bondage or consequences, which inflicts injury and is impractical, is said to be action in the mode of ignorance.

Source: Bhagavad Gita As It Is