This is the 314th most frequent Chinese word.
完全
Completely; fully; entirely.
Here, 完全 is used as an adverb to modify the verb 明白, emphasizing full comprehension.
我完全明白你的意思。
I completely understand your meaning.
In this sentence, 完全 serves as an adverb to intensify the verb 失败, indicating total failure.
他的计划完全失败了。
His plan completely failed.
Here, 完全 is used as an adverb to denote the complete extent of a characteristic, in this case, being made of wood.