No, "snug" is an adjective. "Snugly" is an adverb.
Cautious IS an adjective. An adjective is an action!
The word "it" is not an adjective (it is a pronoun). A word is an adjective if it modifies (defines, characterizes) a noun or pronoun. The big tent - big is an adjective He is tall - tall is an adjective This key - this (while arguably called a determiner) is a demonstrative adjective
probable is an adjective
Hard is an adjective.
adjective
Snugly Ugly
just two
In a snug manner; closely; safely.
The mood of where you find yourself snug
smugly, snugly, snuggly
England is situated snugly between Scotland and France
Their Shapes Fit Snugly Together.
Their Shapes Fit Snugly Together.
Their Shapes Fit Snugly Together.
Their Shapes Fit Snugly Together.
Their Shapes Fit Snugly Together.
Their Shapes Fit Snugly Together.