Desultory (adjective)

1. Lacking a plan, purpose, or enthusiasm; haphazard and aimless.
2. Lacking continuity or coherence; disconnected and disjointed.

Origin:

From latin desultorius, meaning "leaping from horse to horse".

Examples:

1. He had a desultory approach to his studies.
2. The conversation was desultory and lacked a clear direction.
3. The desultory search for a new job was frustrating.
4. The desultory conversation was marked by long pauses and non sequiturs.
5. His desultory behavior made it hard for him to hold down a job.