it isn't good enough

The sea isn't warm enough

What is essential is invisible to the eye

TOO + ADJECTIVE + (infinitive)

Use TOO+ ADJECTIVE to say that there is more than we need or want. Explains a problem.This shirt is TOO SMALL This library is TOO LITTLE I am TOO TIRED to walk.

(not) + ADJECTIVE + ENOUGH + (infinitve)

We use NOT + ADJECTIVE + ENOUGH to say that there is less than we need or want. It explains a problem. There is NOT ENOUGH space My computer is NOT FAST ENOUGH My hair is NOT LONG ENOUGH I am NOT GOOD ENOUGH to play soccer

ADJECTIVE + ENOUGH

We use ADJECTIVE + ENOUGH to show that there is no problem.My house is BIG ENOUGH I worked HARD ENOUGH to pass. My bed is COMFORTABLY ENOUGH to rest.

Sources