inappreciative (adjective) thankless: unappreciative, inconsiderate (in behavior)
Sinonime: acquisitive, avaricious, avid, carnivorous, close, close-fisted, covetous, craving, desirous, devouring, eager, edacious, esurient, gluttonous, gobbling, gormandizing, grabby, grasping, grudging, gulping, guzzling, hoggish, hungry, impatient, insatiable, insatiate, intemperate, itchy,
miserly, niggardly, omnivorous,
parsimonious, pennypinching,
penurious, piggish, prehensile, rapacious, ravening, ravenous,
selfish,
stingy, swinish,
tight*, tight-fisted,
voraciousAntonime: abstemious,
benevolent,
charitable,
extravagant,
generous,
liberal,
philanthropic