ungrateful

adjectives

not feeling or showing gratitude

"ungrateful heirs"; "How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare

thankless, ungrateful, unthankful

is derived from

antonym

disagreeable

"I will not perform the ungrateful task of comparing cases of failure"- Abraham Lincoln

ungrateful

is similar to

disagreeable to the senses, to the mind, or feelings

"an unpleasant personality"; "unpleasant repercussions"; "unpleasant odors"