Bhagavad Gita · 18.28

अयुक्तः प्राकृतः स्तब्धः शठो नैष्कृतिकोऽलसः।विषादी दीर्घसूत्री च कर्ता तामस उच्यते॥

ayuktaḥ prākṛitaḥ stabdhaḥ śhaṭho naiṣhkṛitiko 'lasaḥ viṣhādī dīrgha-sūtrī cha kartā tāmasa uchyate

The doer who is undisciplined, vulgar, stubborn, deceitful, malicious, lazy, despondent, and procrastinating — is said to be tamasic.

— Bhagavad Gita 18.28

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)