IPA: /ˈɛfərtfəli/
KK: /ˈɛfərtfəli/
In a way that requires a lot of physical or mental energy; with great effort.
She completed the project effortfully, putting in long hours and hard work.
Effortfully → It is formed from "effort" (from Old French *esforz*, meaning exertion or strength) and "-fully" (meaning in a manner full of). The word "effortfully" means in a manner full of exertion or effort.
Think of putting in a lot of 'exertion' ('effort') and doing it 'in a manner full of' ('-fully'). This helps you remember that effortfully means doing something with a lot of effort.