| Main Entry: | breakneck |
| Part of Speech: | adjective |
| Definition: | extremely fast |
Synonyms: |
at full tilt, dangerously fast, excessive, flat out, headlong, high-speed, lightning, precipitate, rapid, reckless, speedy, whirlwind |
Antonyms: |
extremely slow |
| Main Entry: | express |
| Part of Speech: | adjective |
| Definition: | direct, speedy |
Synonyms: |
accelerated, fast, high-speed, nonstop, quick, rapid, swift, velocious |
Antonyms: |
indirect, slow |