1) Businesslike 2) Decided 3) Decisive 4) Determined 5) Determined to achieve a goal 6) Earnest 7) Firm 8) Fixed 9) Full of meaning 10) Goal-directed 11) Having a purpose 12) Leading 13) Meaningful 14) Not to be denied 15) Persistent 16) Purpose-built 17) Purpose-made 18) Purposive 19) Resolute 20) Significant Found on https://www.crosswordclues.com/clue/purposeful