Counterproductive antonyms

What is the opposite word for Counterproductive?

• productive

  worthless, useless
• effective

  useless, not working
• useful

  not working, of no use
• helpful

  harmful, not working
• beneficial

  useless, harmful
• profitable

  useless, not working
• worthwhile

  not working, useless
• friendly

  harmful
• kind

  harmful
• impartial

  harmful
• unbiased
• unprejudiced
• assisting
• advantageous
• fair
• just
• aiding
• nice
• favorable
• good
• fruitful

  of no use
• valuable

  of no use
• sensible
• meaningful

  of no use
• hopeful
• important

  of no use
• significant
• approving
• usable
• working