pragmatist

Short definition from Wiktionary

Noun

1. 1
   One who acts in a practical or straightforward manner; one who is pragmatic; one who values practicality or pragmatism.
2. 2
   One who acts in response to particular situations rather than upon abstract ideals; one who is willing to ignore their ideals to accomplish goals.
3. 3
   One who belongs to the philosophic school of pragmatism; one who holds that the meaning of beliefs is the actions they entail, and that the truth of those beliefs consists in the actions they entail, successfully leading a believer to their goals.
4. 4
   An advocate of pragmatism.
5. 5
   One who studies pragmatics.

Adjective

1. 1
   Advocating pragmatism.