If someone says that to you, I guess it means "ungrateful child". Not very nice. Worth thinking over what did you do to deserve it.
grading papers is a thankless task
Teaching is a thankless task.
Writing this sentence is a thankless task.
Wendy was very thankless to her her uncle because she didnt help him.
Here are some examples: Washing dishes is a thankless job. Although the garbage collector knew his was a thankless job, he worked hard to do a good job.
Humanitarian.
becausewesuckdick
thankless, unappreciative, ungrateful
The cast of His Thankless Job - 1917 includes: Lloyd Bacon as Overworked Husband Elinor Field as Wife Raymond Griffith as Unemployed Man
bounder, self-seeker, thankless person
Being a janitor in a large high school is a thanklessjob.
How sharper than a serpent's tooh it is to have a thankless child.