While not a deeply philosophical term like 关系 (guānxi), `完全` plays a crucial role in communication by providing clarity and certainty. In a culture that can sometimes value indirectness and subtlety to maintain harmony, using `完全` is a way to be direct and unequivocal. Compared to the English word “totally,” which can sometimes be used as informal slang (“That's, like, totally awesome”), `完全` is a standard, neutral intensifier suitable for all levels of formality. It is just as appropriate in a business report (`这个计划完全可行` - This plan is completely feasible) as it is in a casual conversation (`我完全忘了` - I totally forgot). Its primary function is to remove ambiguity, making it a powerful tool for clear expression. The structure `完全 + 不/没` (“completely not”) is one of the most common and definitive ways to express negation in Chinese.
`完全` is an extremely common word used daily in various contexts.