to do something intentionally is to do it on purpose, to mean to do it - for example 'I hurt you intentionally'

You can use "intentionally" in a sentence to describe an action that was done on purpose or with a specific goal in mind. For example, "She intentionally left her keys at home to avoid driving in rush hour traffic."

She intentionally ignored his calls to send a message.

The word intentionally is an adverb. It means to do something in an intentional manner.

Economics