ἀτακτέω/atakteō

This word is an action. It is a verb.

This word can mean to behave in a careless way.
This word can mean to be idle or lazy. When used in this way, this word is used to talk about a person acting so that he does not do work or some other action that another person expects him to do.

See: 2 Thessalonians 3:7