a person who is unusually selfish

taking immediate advantage, often unethically, of any circumstance of possible benefit

taking advantage of opportunities without regard for the consequences for others

someone who is willing to trade favors or services for mutual advantage

an opportunist who profits from the misfortunes of others

an outsider who seeks power or success presumptuously

a shrewd or unscrupulous person who knows how to circumvent difficulties

one who conforms to current ways and opinions for personal advantage