'bratty' originates from the word 'brat,' which is of uncertain origin but has been used in English since the 16th century to describe a child, often in a derogatory sense.

'brat' was used in Middle English to describe a child, and over time, 'bratty' emerged as an adjective to describe the behavior associated with a 'brat.'

Initially, 'brat' referred to a child, but 'bratty' evolved to describe the negative behaviors often associated with spoiled children.