Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: thank (noun); THANKS2

thankless

 adjective
     
thank‧less
1 a thankless job is difficult and you do not get any praise for doing it
thankless task/job/chore etc
Cooking every day is a thankless task.
2 literary a thankless person is not grateful
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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