Having or exhibiting no mercy; merciless.(adjective)
Exceeding a normal or reasonable limit; excessive: unmerciful heat. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "unmerciful" in a sentence
"Due to unmerciful teasing from his classmates, B. had shed his first name in junior high."
"Whereas before I spent most of my days trying to escape the unmerciful teasing and mistreatment by the Mormon children and the weirdoes in my own family by reading Torah all day, I now began spending all of my days escaping the same things by reading about the occult interpretations of the Torah."
"Coversions by the sword, sex and terror will be the rule of Allah the most unmerciful."