adj.
Pronunciation: ˌ ə n- ' gr ā t-f ə l
Function: adjective
Date: 1533
1 : showing no gratitude : making a poor return <an ungrateful child>
2 : DISAGREEABLE also : THANKLESS
– un · grate · ful · ly \ -f ə -l ē \ adverb
– un · grate · ful · ness noun