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That action which is undertaken from delusion, without a regard for the conseences, loss, injury and (one's own) ability that is declared to be Tamasic (dark).

Action undertaken out of delusion, without regard for consequences, loss, harm to others or one's own capacity, is called tamasic.

Tamasic action is begun out of delusion, without considering its consequences, the loss it may cause, the harm to others, or one's own ability to carry it out. Such action is reckless and blind. The verse lists the very factors that a thoughtful person weighs before acting. It is a reminder that the Gita's call to act is never a call to act thoughtlessly; responsible action requires attention to results and to others, even while one is not attached to them.