Deep in thought and heedless of present circumstances or activities; preoccupied.(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 "absent-minded" in a sentence
"Josie looked up at Paul, her expression absent-minded."
"Even the most absent-minded can't miss the tall-masted ships in the harbor."
""Pockets is the damnedest things I ever see for makin 'a man absent-minded," he communed that night, as he crawled into his blankets."