Question

imperiously has the same or almost the same meaning as:
unilaterally
nonchalantly
impiously
domineeringly

Explanation:

• "Imperiously" means in a domineering or overbearing manner.
• "Unilaterally" means one - sidedly.
• "Nonchalantly" means casually.
• "Impiously" means disrespectfully to religious things.
• "Domineeringly" means in a bossy, overbearing way, which is similar to "imperiously".

Answer:

domineeringly