Synonyms for Be instrumental:

• v.

  •contribute (verb)
  • sit in on,
  • have a hand in,
  • finger in the pie,
  • redound,
  • be conducive,
  • do one's bit,
  • get in the act,
  • support.

• Other synonyms:

  •Other relevant words:
  • mediate,
  • forward,
  • act for,
  • promote,
  • subserve,
  • serve,
  • minister,
  • facilitate,
  • contribute,
  • minister to,
  • officiate.

Antonyms for Be instrumental:

• v.

  • contribute
    harm, stop, subtract, shun, disapprove, withdraw, counteract, injure, oppose, take, withhold, hinder, take away, neglect, weaken, decrease, hurt.