pyrrhic - (of a victory) won at too great a cost to have been worthwhile for the victor.

pyrrhic

ˈpɪrɪk/

adjective

1. (of a victory) won at too great a cost to have been worthwhile for the victor.

adroitly - in a clever or skilful way.

adroitly

əˈdrɔɪtli/

adverb

1. in a clever or skilful way.

   "he managed the evacuation adroitly"