Meaning of “too” - Learner’s Dictionary

too

adverb uk us /tuː/
too small/heavy/much, etc

A1 used before adjectives and adverbs to mean 'more than is allowed, necessary, possible, etc':

The film is also far too long.
There are too many cars on the roads these days.
[ + to do sth ] I decided it was too early to get up and went back to sleep.

A1 also:

Do you know Jason too?
I'll probably go there next year too.
not too

A2 used before adjectives and adverbs to mean 'not very':

"How was your exam?" "Not too bad, I suppose."
I didn't play too well today.

(Definition of “too” from the Cambridge Learner’s Dictionary © Cambridge University Press)