desultory
Moving from thing to thing without focus or real effort.
Desultory means jumping around without purpose or plan, lacking focus or clear direction. When someone gives a desultory effort at homework, they work on math for two minutes, then doodle, then check a different subject, never really settling into anything. A desultory conversation wanders from topic to topic without going anywhere meaningful: weather, then lunch, then someone's shoes, then back to weather.
The word captures that aimless, half-hearted quality when you're not really committed to what you're doing. A student making a desultory attempt to clean their room might move one book, then look out the window, then straighten a poster, accomplishing little because they never focus long enough to make real progress.
Desultory suggests a lack of method or enthusiasm, like leafing through a book without actually reading it or practicing piano in a disconnected way that doesn't improve your skills. When you approach something in a desultory manner, you're going through the motions without the concentration or energy needed to accomplish anything worthwhile.