Colorful, maybe.
Shutting
approach, increase
Standing
stopping
Teenager
'Moisture' is an eight-letter word meaning wetness.
The word is roundest.
Stopping
The opposite of not opening is opening. Eight-letter synonyms for opening, depending on context, include clearing, unlacing, exposing, starting
Imprison is a word which has the opposite to liberate and has eight letters
Famished.
Affluent