Old English idellice "vainly;" see idle + -ly (2). From late 14c. as "in an idle or indolent way."
this is what I always imagined myself doing in the south of France, sitting idly, drinking coffee, watching the people
idioticon
idiotype
idle
idleness
idler
idly
Ido
idol
idolater
idolatrous
idolatry