enough 这里是副词,还是形容词?

enough 这里是副词,还是形容词?
百度词典看到的,
形容词 a.
1.
足够的,充足的
I was fool enough to trust him.
我真傻,竟会信赖他.
副词 ad.
1.
足够地;充分地[+to-v]
I'm old enough to handle my own affairs.
我已经长大了,可以处理我自己的事
enough 我觉得两个例句中 都是副词吧,这里都是在形容词后面了,一个是副词,一个却是形容词?怎么回事?
enough ,作为形容词时,用在名词前.
作为副词时,放在所修饰的形容词或副词之后使用.

enough可以是副词,限定词,或代词
限定词 determiner：Have you made enough copies?Is there enough room for me?
副词 adverb：This house isn't big enough for us.She's old enough to decide for herself.
代词 pronoun：Six bottles should be enough.Have you had enough (= to eat)?
你举的两个例子fool enough& big enough 都是副词.英式英语中enough没有所谓的“形容词”此行,determiner的用法类似于形容词词性,因为作为determiner时,enough多放在复数或不可数名词前,表示as many or as much as somebody needs or wants