BT San 46b(24)var. :קליל"קיל" לי עלמא‏ : the world is too light for me=I am unstable
See the entire entry for qyl adj. lenient

BT San 46b(24) :כמאן דאמ׳, קליל לי עלמא‏ : like the one who says "the world is light [opposite is כבד] for me" [i.e. I am light-headed?]
See the entire entry for qallīl adj. light; quick; few