Final answer:
Characters like Matilde may appear ungrateful in literature due to their dissatisfaction with their lives and a failure to appreciate what they have, often feeling entitled to more.
Step-by-step explanation:
The character of Matilde or similar characters found in various literary works may be described as ungrateful due to a discontentment with their current circumstances or a lack of appreciation for the kindness or possessions they have. In literature, such characters often believe they are entitled to more than what they currently possess or experience, leading to a persistent sense of dissatisfaction and ingratitude. This attribute is observed in characters who fail to recognize their privileges or who are solely focused on their deficiencies, devoid of acknowledgment for the positive aspects of their life.