Synonyms of instrumental in English:
he was instrumental in developing new diagnostic procedures the company's record was instrumental in its ultimate failure
involved, active, influential, contributory;
helpful, of help/assistance, useful, of use/service;
(be instrumental in)play a part in, contribute to, be a factor in, be (partly) responsible for, have a hand in;
add to, help, promote, advance, further, forward, oil the wheels of, open the door for, be conducive to, make for;
[Antonyms] uninvolved, obstructive
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