without doing, causing, or making
Practically speaking it means without meddlesome, combative, or egotistical effort. The character Wei developed from symbols for a clawing hand and a monkey, since the term Wu Wei means no going against the nature of things; no clever tampering; no Monkeying Around.
The efficiency of Wu Tang is like that of flowing water, excuse me, Wu Wei has an efficiency that is like that of flowing water.
Here is an example from the writings of Classical Chinese philosopher Zhuāng -Zhou, commonly known in the western academic world as Chuang-tse, on application:
“At the Gorge of Lu, the great waterfall plunges for thousands of feet, its spray visible for miles. In the churning waters below, no living creature can be seen.
One day, K’ung Fu-tse was standing at a distance from the pool’s edge when he saw an old man being tossed about in the turbulent water. He called to his disciples and together they ran to rescue the victim. But by the time they reached the water, the old man had climbed out onto the bank and was walking along, singing to himself.
K’ung Fu-tse hurried up to him. “You would have to be a ghost to survive that,” he said, “but you seem to be a man, instead. What secret power do you have?”
“Nothing special,” the old man replied. “I began to learn while very young and grew up practicing it. Now I am certain of success. I go down with the water and come up with the water. I follow it and forget myself. I survive because I don’t struggle against the water’s superior power. That is all.”