the.com/ingratitude
the art of receiving a kidney and complaining it didn't come gift-wrapped.
means the failure to feel or show thankfulness for a kindness, gift, or benefit received.
from From Latin ingratus, 'unthankful, unpleasant' — built from the negating prefix in- ('not') on gratus, 'pleasing, thankful.' That same gratus is the root of 'grateful,' 'gratitude,' and 'gratis,' so ingratitude is quite literally the un-doing of grace: a thing given freely (gratis) and met with no pleasure (gratus) returned. It reached English through Old French ingratitude in the late Middle Ages.
shakespeare's worstHe called it harsher than winter's wind in King Lear.
darwin's noteEven monkeys protest when peers get the better grape.
latin rootFrom ingratus, meaning unpleasing and unthankful both.
survival quirkBrains forget favors faster than they forget grudges.