IPA: /ˈpɜːrpəsfəli/
KK: /ˈpɜr.pəs.fəl.i/
In a way that shows intention or determination; done with a specific aim or goal in mind.
She walked purposefully towards her destination, knowing exactly what she wanted to achieve.
Purposefully → It is formed from "purpose" (from Old French *porpos*, meaning intention or aim) and "-fully" (meaning in a manner full of). The word "purposefully" means in a manner that is full of intention or aim.
Think of having a clear 'intention' ('purpose') and doing something 'in a full manner' ('-fully'). This helps you remember that 'purposefully' means acting with intention.