This adjective describes persons who lack gratitude or fail to show thanks. Classical Greek used it for ungracious, unpleasant people or unrewarding tasks, but in the New Testament it focuses specifically on the moral failure of ingratitude. Jesus uses it to describe how God shows kindness even to the 'ungrateful and evil' (Luke 6:35), while Paul lists it among the vices characterizing people in the last days (2 Tim 3:2). The word combines the negative prefix with 'charis' (grace/favor), suggesting someone immune to grace or unwilling to acknowledge gifts received. All languages render this straightforwardly as 'ungrateful', showing universal recognition of this vice.