Lacking a purpose; meaningless or aimless.(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 "purposeless" in a sentence
"And they often "ride with passengers on what we call 'purposeless trips,'" McNaull says."
"By the time Weinberg unveiled his gloomy view, the notion of a purposeless, meaningless universe was already on a roll in science."
"'Rational ignorance' and psychological bias are perfectly compatible; it has to be understood that rationality itself is 'purposeless', it makes no commands, demands nothing."