conformist
[noun]
Synonyms: traditionalist, stick-in-the-mud (informal), yes man

[TahlilGaran] English Synonym Dictionary ▲

con‧form‧ist AC /kənˈfɔːməst, kənˈfɔːmɪst $ -ɔːr-/ adjective
[Word Family: noun: conformity, conformist; verb: conform; adjective: conformist]
thinking and behaving like everyone else, because you do not want to be different, or forcing people to do this – often used to show disapproval ⇒ nonconformist:
a country with a conformist education system
—conformist noun [countable]

[TahlilGaran] Dictionary of Contemporary English ▲