Simple past tense and past participle of overprepare.(verb)
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Use "overprepared" in a sentence
"That's ok, I'll take the feeling of "overprepared" over "underprepared" any time."
"Palin may be "overprepared" and not encouraged to be herself, an adviser said."
"Two months later, though, I'm unclear how Palin was "overprepared" for questions about what periodicals she enhanced her foreign policy credentials, as she suggested to Charlie Gibson."