An imperfection that mars or impairs; a flaw or defect.(noun)
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 "blemish" in a sentence
"Hes a very aggressive player whose only blemish is that hes not a great skater."
"It is being described as a blemish on Egypt and Egyptians."
"As the Star Tribune's Emily Johns reported last week, "The state's vexing achievement gap has become a long-term blemish on an otherwise good reputation for educational performance.""