अयुक्तः प्राकृतः स्तब्धः शठो नैष्कृतिकोऽलसः।विषादी दीर्घसूत्री च कर्ता तामस उच्यते॥
ayuktaḥ prākṛtaḥ stabdhaḥ śaṭho naiṣkṛtiko ‘lasaḥviṣādī dīrgha-sūtrī ca kartā tāmasa ucyate
Word by word
The verse says
Unsteady, coarse, stiff, crooked, cutting other people down, idle, gloomy, and endlessly putting things off: that doer is called dark.
In plain words
The third kind, and it is the longest list of the three.
Eight faults. And the last one, dīrgha-sūtrī, literally means long-threaded: the person who spins a task out forever.
It sits at the end of a list that includes cruelty and deceit, which is a strange place for procrastination until you see what it has in common with them.
Where you've felt this · in failure
Your neighbour has been going to fix his broken gate for two years. He is not busy. Every few months he mentions the gate. He has priced the hinges twice. Nothing in his life would be worse if the gate were fixed, nothing is stopping him, and the gate is still broken.
Going deeper
Putting things off is listed alongside cruelty here, and the shared root is worth naming rather than treating as an odd pairing.
All eight items are forms of weight. Stiffness will not move. Gloom cannot be lifted. Idleness does not start. Endless delay starts and does not finish. The heavy strand does not push in a bad direction so much as refuse to be moved in any direction.
That is also why these faults are so hard to address from inside. Every one of them disables the faculty you would need to address it. The stiff person cannot hear the suggestion; the idle person cannot begin the fixing.
So the honest note is that this condition rarely breaks from within. It usually needs something external and small: a fixed time, another person expecting you, a first step tiny enough that the weight does not notice it going.