Question

nonchalantly has the same or almost the same meaning as: efficiently defiantly casually incessantly

Explanation:

• "Nonchalantly" means in a casual and relaxed manner.
• "Efficiently" means in a way that achieves maximum productivity with minimum wasted effort.
• "Defiantly" means in a way that shows bold resistance or opposition.
• "Casually" means in a relaxed, informal way.
• "Incessantly" means without interruption.

Answer:

casually