Synonyms: thankless, ungrateful, unthankful
Definition: not feeling or showing gratitude
Usage: ungrateful heirs; How sharper than a serpent's tooth it is / To have a thankless child!- Shakespeare
Similar words: unappreciative
Definition: not feeling or expressing gratitude
Usage: unappreciative of nature's bounty
Synonyms: ungrateful
Definition: disagreeable
Usage: I will not perform the ungrateful task of comparing cases of failure- Abraham Lincoln
Similar words: unpleasant
Definition: disagreeable to the senses, to the mind, or feelings
Usage: an unpleasant personality; unpleasant repercussions; unpleasant odors