Not conforming to type; unusual or irregular.(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 "atypical" in a sentence
"Those lawyers would be well advised to think out - side of the box, and to use their legal skills in atypical ways."
"One thing which makes my experience atypical is that I either learned it or became aware of it in my teens."
"In that sense, it could be called atypical for the year."