1) Expedient 2) Opportunist 3) Opportunistic 4) Servility 1) Expedient 2) Opportunist 3) Opportunistic 
• (a.) Obsequiously complying with the spirit of the times, or the humors of those in power. • (n.) An obsequious compliance with the spirit of the times, or the humors of those in power, which implies a surrender of one`s independence, and sometimes of one`s integrity.
Time'serv`ing adjective Obsequiously complying with the spirit of the times, or the humors of those in power.