1ADV 仅仅;完全 You use purely to emphasize that the thing you are mentioning is the most important feature or that it is the only thing which should be considered. 仅仅;完全 [emphasis]
It is a racing machine, designed purely for speed.
那是一个比赛用的机器,完全是为提高速度设计的。
The government said the moves were purely defensive.