not liking changes or new ideas:
a very conservative attitude to education
belonging to or concerned with the Conservative Party in Britain:
a Conservative MP
not very modern in style, taste etc [= traditional]:
a dark conservative suit
a guess which is deliberately lower than what the real amount probably is:
At a conservative estimate, the holiday will cost about £1500.
a fortune conservatively estimated at 2 million dollars
He was conservatively dressed in a dark business suit.