过去式是weakened，中文意思是v.

(使)虚弱，衰弱;减弱;削弱;使(肯定程度)减弱;动摇;犹豫;

词典

weaken的过去分词和过去式;

例句

Germany's attack has been weakened by the loss of some key players through injury.

德国队几名主力队员因伤不能上场，削弱了进攻力量。