completely：
adv. 完全地，彻底地完整地
My attitude towards this matter is completely different from yours.
我对这件事的态度跟你的截然不同。
fully：
adv. 充分地完全地彻底地I fully understand your motives.
我完全理解你的动机。
He had still not fully recovered.
他还没有彻底康复。
We are fully aware of the dangers.
我们充分意识到危险。
He is now fully restored to health.
他现在完全恢复了健康。
She was fully aware of my thoughts.
她完全了解了我的想法。
