thankless

  • (a) not feeling or showing gratitude
    • ungrateful heirs
    • How sharper than a serpent's tooth it is / To have a thankless child! - Shakespeare
    ungrateful, unthankful,
  • (s) not likely to be rewarded
    • grading papers is a thankless task
    unappreciated, ungratifying,

Synonyms

ungrateful unthankful unappreciated ungratifying

Antonyms

grateful thankful

Words of close approximity

thankless wretch