Something purposeful is done on purpose: it's meant to achieve an aim.

Lots of things happen accidentally or randomly, but other things have a purpose. Such things can be called purposeful. Going to college, starting a family, giving to a charity, and adopting a dog are all purposeful acts. People have a reason for doing them, and they want to accomplish something specific. Purposeful things are thought-out and intentional.

Definitions of purposeful

adj serving as or indicating the existence of a purpose or goal

having a meaning or purpose
businesslike, earnest
not distracted by anything unrelated to the goal
goal-directed, purposive
having a purpose
purpose-built, purpose-made
designed and constructed to serve a particular purpose
firm in purpose or belief; characterized by firmness and determination
not evidencing any purpose or goal
meaningless, nonmeaningful
having no meaning or direction or purpose
adrift, afloat, aimless, directionless, planless, rudderless, undirected
aimlessly drifting
marked by lack of definite plan or regularity or purpose; jumping from one thing to another
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adj having meaning through having an aim

“led a happy purposeful life”
having a meaning or purpose

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