Dictionary and Thesaurus

Definition of Thankless

• (a.) Not acknowledging favors; not expressing thankfulness; unthankful; ungrateful.
• (a.) Not obtaining or deserving thanks; unacceptable; as, a thankless task.

Synonyms of Thankless

• Ungrateful
• Unthankful
• Unappreciated
• Ungratifying

Antonyms of Thankless

• Grateful

Homophones of Thankless