まったり
まったり意味：ゆったりとしているさま。のんびりと落ち着いた気分であるさま。また、だらだらしているさま。(Yahoo! Dictionary)
Definition: Easy going, relaxed, calm, laid back; sluggish
I heard this word in the drama "Hotaru no Hikari" about this girl who enjoys doing nothing and drinking beer.(That's basically all she ever did at home- I kid you not). まったり was thus used to describe her laid-back lifestyle.
例文：夏休みをまったり過ごす To spend a relaxed summer