ungrateful Meaning, Definition & Usage

  1. adjective not feeling or showing gratitude
    thankless; unthankful.
    • ungrateful heirs
    • How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare
  2. adjective satellite disagreeable
    • I will not perform the ungrateful task of comparing cases of failure"- Abraham Lincoln

WordNet

Un*grate"ful adjective
Definitions
  1. Not grateful; not thankful for favors; making no returns, or making ill return for kindness, attention, etc.; ingrateful. South.
  2. Unpleasing; unacceptable; disagreeable; as, harsh sounds are ungrateful to the ear. -- Un*grate"ful*ly, adv. -- Un*grate"ful*ness, n.

Webster 1913