Definitions for laid-back
Random House Webster's College Dictionary
relaxed; easygoing; carefree.
Category: Common Vocabulary, Status (usage)
Origin of laid-back:
unhurried and relaxed
"a mellow conversation"
Kernerman English Learner's Dictionary
relaxed and willing to accept whatever happens; = easygoing
He's a laid-back kind of guy.
relaxed and easy-going; an absence of stress or worry
Origin: From U.S. slang (circa 1950s)