Ungrateful \Un*grate"ful\, a.

1. Not grateful; not thankful for favors; making no returns, or making ill return for kindness, attention, etc.; ingrateful. --South. [1913 Webster]

2. Unpleasing; unacceptable; disagreeable; as, harsh sounds are ungrateful to the ear. [1913 Webster] -- Un*grate"ful*ly, adv. -- Un*grate"ful*ness, n. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

ungrateful adj
1: not feeling or showing gratitude; "ungrateful heirs"; "How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare [syn: thankless, unthankful] [ant: grateful]
2: disagreeable; "I will not perform the ungrateful task of comparing cases of failure"- Abraham Lincoln

Source: WordNet (r) 2.0
 

Ungrateful \Un*grate"ful\, a.

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.

Source: Webster's Revised Unabridged Dictionary (1913)