self-seeker

1. He's a self-seeker; he's always on the make.
   这个人才奸哪，总想占便宜。
2. Qualify one's friend as a self-seeker.
   把朋友说成自私自利的人。
3. He was well known for his habit of always taking care of number one. qualify one's friend as a self-seeker
   他自私自利的习惯是出了名的。把朋友说成自私自利的人

noun

1. a person who places expediency above principle

   Synonym:    opportunist