purposeful

Concise Oxford English Dictionary © 2008 Oxford University Press:
purposeful/ˈpɜːpəsfl/

▶adjective

• 1 resolute.

• 2 having a strong purpose: purposeful activities.

– derivatives
purposefully adverb,
purposefulness noun.

usage: The adverbs purposefully, purposely, and purposively have different meanings. Purposely means ‘on purpose, deliberately’, while purposefully means ‘resolutely’ or ‘with a strong purpose’, as in he strode purposefully through the courtyard. The uncommon word purposively means ‘with a particular purpose’.