The adjective of the word `authority` is :
authorise
author
authoritatively
authoritative
Explanation:
Correct Answer is: authoritative
– প্রদত্ত প্রশ্নে `authority` এর adjective হচ্ছে Authoritative.
• Authoritatively হচ্ছে adverb.
• Author হচ্ছে noun & verb.
Source: Merriam-Webster Dictionary.