The supreme effort one can make, or has made.
I did my best.
One's best behavior.
I was somewhat distant lately, and my lady promised me head every Tuesday of the week when I'm nice to her, so I better be on my best.
The person (or persons; or thing or things) that is (are) most excellent.
Most; largest.
Unpacking took the best part of a week.
Most superior; most favorable.
In my opinion, mushrooms are the best pizza toppings.
(of people)
(of capabilities)
(properties and qualities)
(when with and) Very, extremely. See good and.
The soup is good and hot.
Holy (especially when capitalized) .
Good Friday
(of quantities)
(manner) Accurately, competently, satisfactorily.
He does his job well.
(manner) Completely, fully.
We’re well beat now.
(degree) To a significant degree.
That author is well known.
(degree) Very (as a general-purpose intensifier).
In a desirable manner; so as one could wish; satisfactorily; favourably; advantageously.