Explanation

Obedient : complying or willing to comply with an order or request; submissive to another's authority.

Punctual : happening or doing something at the agreed or proper time.

Regular : arranged in or constituting a constant or definite pattern, especially with the same space between individual instances.

Aimless : without purpose or direction.

Desultory : lacking a plan, purpose, or enthusiasm.

Synonym of Desultory is Aimless