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Use "underconfident" in a sentence
"Do individuals have unbiased beliefs, or are they over - or underconfident?"
"Narrated by Michael Gambon, the series follows reluctant hero, Krod Mandoon (Maguire, "Meet the Spartans"), a thin-skinned and underconfident freedom fighter, who is the last great hope in the struggle against the evil ruler, Chancellor Dongalor (Lucas, "Little Britain USA")."
"Err on the side of being overconfident rather than underconfident; your agent can help you tone it down later if they like the concept."