Hello Sky.Stars,
Other adjectives with meanings synonym to "confident" or closely related to it :
assured , balanced, certain, collected , composed , cool ,eager, fond, full of hope , proud, secure, self-important, self-assertive, optimistic,
satisfied , valiant,self-respecting, independent , self-esteeming , self-contended.
Ones related to the adjective "determined":
actual , adamant , factual ,strong-minded, wholehearted, relentless,
decisive, firm , oversure , persistent, persuaded, willing.
"and the against " ? You mean the contrary ?
If so :
Some antonyms for " confident" :
hesitant , insecure, unassured, uncertain , unconfident , shifty , frail ,weak , vulnerable ,shaky , doubtful , dubious.
Antonyms for "determined":
indecisive , shrinking , shy, modest, slow to act, irresolute, careful, boggling , mindful , averse, wavering, skeptical , wobbly .