extremely sharp
Example:
- razor-sharp teeth
- a razor-sharp blade/edge/knife
showing that somebody is extremely intelligent
Example:
- a razor-sharp mind
cá hồi cầu vồng
/ˌreɪnbəʊ ˈtraʊt//ˌreɪnbəʊ ˈtraʊt/extremely sharp
showing that somebody is extremely intelligent