'maliciously' originates from Latin, specifically the word 'malitiosus,' where 'mal-' meant 'bad' and '-itiosus' meant 'full of.'

'malitiosus' transformed into the Old French word 'malicious,' and eventually became the modern English word 'maliciously' through Middle English.

Initially, it meant 'full of badness or evil,' but over time it evolved into its current meaning of 'in a manner characterized by malice or ill will.'