1) Backscratcher 2) Carpetbag 3) Carpetbagger 4) Entrepreneur 5) Expedient 6) Johnny on the spot 7) Opportunistic 8) Timeserver 9) Timeserving 10) User 1) Expedient 2) Knock heeder 3) Opportunistic 4) Timeserving 
• (n.) One who advocates or practices opportunism.
Op`por·tun'ist noun [ Confer French opportuniste .] One who advocates or practices opportunism. [ Recent]
[adj] - taking immediate advantage, often unethically, of any circumstance of possible benefit 2. [n] - a person who places expediency above principle
opportunistic adjective taking immediate advantage, often unethically, of any circumstance of possible benefit
A bacteria that causes clinical disease in animals that are some how weakened and can not fight off the infection.
An opportunist is an animal that will feed on whatever suitable food is available to them at any given time. Many dolphins are opportunist and love to eat many different types of fish and squid.
[SAT terms] a person who places expediency above principle