> Marked by lack of definite plan, regularity, or purpose
> Not connected with the main subjects
> Disappointing in progress, performance, or quality
The Latin adjective desultorius, the parent of desultory was used by the ancients to refer to a circus performer (called a desultor) whose trick was to leap from horse to horse without stopping.
Example
She made a desultory attempt at conversation.
He wandered around, clearing up in a desultory way.