a person who for personal advantage adapts his or her patterns of behavior to suit the mood of the times or to please those in power; toady
One who conforms to the prevailing ways and opinions of one's time or condition for personal advantage; an opportunist.
- A person who conforms to current opinions, especially for reasons of personal advantage; an opportunist. [from 16th c.]
- Someone who performs a job for the required time only, making a minimum of effort. [from 19th c.]
- (computing) A device, node or program that distributes the correct time to clients in a network.