Dictionary and Thesaurus

Definition of Ungrateful

• (a.) Not grateful; not thankful for favors; making no returns, or making ill return for kindness, attention, etc.; ingrateful.
• (a.) Unpleasing; unacceptable; disagreeable; as, harsh sounds are ungrateful to the ear.

Synonyms of Ungrateful

• Thankless
• Unthankful

Antonyms of Ungrateful

• Grateful

Homophones of Ungrateful