refine vs weaken

To purify; reduce to a fine, unmixed, or pure state; to free from impurities. 

To improve in accuracy, delicacy, or excellence. 

To become pure; to be cleared of impure matter. 

To purify of coarseness, vulgarity, inelegance, etc.; to polish. 

To make nice or subtle. 

To make weaker or less strong. 

To become weaker or less strong.