purposeful
adjective /ˈpɜːpəsfl/
  /ˈpɜːrpəsfl/
- having a useful purpose; acting with a clear aim and with determination- Purposeful work is an important part of the regime for young offenders.
- She looked purposeful and determined.
- It is only in the past 20 years that this data has been gathered in any purposeful way.
 Oxford Collocations DictionaryPurposeful is used with these nouns:- stride
- work