'Pretty Confident'13 Apr 2019 14:11
'Pretty' weaken the adverbs or adjectives that they modify. They tell you that the quality described by the adverb or adjective is present, but only to a limited extent, as shown in the examples below. The meaning of pretty is similar to the meaning of another intensifier: somewhat.
Examples:
The movie was pretty good but not great. (=The movie wasn’t good, but it wasn’t bad either. It was okay.)
I have to leave pretty soon. (=I don’t have to leave right now, but I can’t stay for a long time.)
Pretty far from certain, wasn't he?
KOH