optimistic
/ˌɒptɪˈmɪstɪk/adjective
1- hopeful and confident about the future乐观的, 乐观主义的：
the optimistic mood of the Sixties
六十年代的乐观主义情绪
he was optimistic about the deal.
他对交易抱乐观态度。
1.1
- involving an overestimate（估计）过于乐观的, 高估的：
previous estimates of whale numbers may be wildly optimistic.
以前对鲸鱼数量的估计可能太过乐观。
派生词