Teaching is often considered a thankless profession, with long hours, little pay, and significant emotional investment.
People purchasing counterfeit goods save money at a large cost to others, specifically children who live on the premises of large warehouse facilities and toil away at sewing machines for long, underpaid, and thankless hours.
If you've ever tried shopping for wide width shoes, you'll already know just what a thankless task it can be.
On the whole they performed a thankless duty with considerable ability.
Apparently this town was cluttered with them and my great-aunt and her husband had a thankless life mission to attend to the trash.