adjective. Not frightened; unafraid.

adjective. not affected by fright

"Thus, it was relevant that you can say "unfrightened" and "unconfused", suggesting that these are adjectives, but you can't say "unfeared" or "unliked", suggesting that these are participles, not adjectives."

fearless  unafraid  

bug-free  defensive-minded  destroyed  fast  ironfisted  

frightened  unenlightened