overoptimistic

/ˌoʊvərˌɑptəˈmɪstɪk/
adjective
  1. Too hopeful or confident about the future, often ignoring possible difficulties.
    • It's okay to be hopeful, but being overoptimistic can lead to disappointment.
    • The weather forecast was overoptimistic; it rained all afternoon.
    • She was overoptimistic about how quickly she could finish the project.
Antonyms
What does "overoptimistic" mean? | whatsthatwordmean | whatsthatwordmean