BG 18.25
अनुबन्धं क्षयं हिंसामनपेक्ष्य च पौरुषम् ।
मोहादारभ्यते कर्म यत्तत्तामसमुच्यते ॥
मोहादारभ्यते कर्म यत्तत्तामसमुच्यते ॥
anubandhaṁ kṣayaṁ hiṁsām anapekṣya ca pauruṣam
mohād ārabhyate karma yat tat tāmasam ucyate
mohād ārabhyate karma yat tat tāmasam ucyate
Word-for-word meanings
tat — that; karma — action; yat — which; ārabhyate — is undertaken; mohāt — out of delusion; anapekṣya — without consideration; anubandham — [of] its consequences; kṣayam — the detriment it may bring; hiṁsām — the violence it may cause to oneself or others; ca — and; pauruṣam — one’s capability to perform it; ucyate — is called; tāmasam — tāmasika.
Translation
That action which is undertaken out of delusion, without considering its consequences, the detriment it may bring, the violence it may cause to oneself or others, and whether one has the requisite power to perform it, is called tāmasika.