The term 'ungrateful' is an adjective used to describe someone who is not thankful or appreciative of something. It can be broken down into several other words, such as 'FORGETFUL' (9 letters), 'INGRATE' (7 letters), 'UNAPPRECIATIVE' (14 letters), 'UNMINDFUL' (9 letters), 'SELFISH' (7 letters), 'UNTHANKFUL' (10 letters), and 'THANKLESS' (9 letters). All of these words are related to the idea of being ungrateful, and they all describe someone who does not show appreciation for what they have been given.