concessive

adjective

• 1characterized by, or tending to concession:we must look for a more concessive approach

• 2 Grammar (of a preposition or conjunction) introducing a phrase or clause denoting a circumstance that might be expected to preclude the action of the main clause, but does not (e.g., in spite of, although).
• (of a phrase or clause) introduced by a concessive preposition or conjunction.