| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Slipshod | 8 | 6 | 2 | 2 |
| Sloppy | 6 | 5 | 1 | 2 |
| Smart | 5 | 4 | 1 | 1 |
| Smarting | 8 | 6 | 2 | 2 |
| Snap | 4 | 3 | 1 | 1 |
| Snappy | 6 | 5 | 1 | 2 |
| Spanking | 8 | 6 | 2 | 2 |
| Speedily | 8 | 5 | 3 | 3 |
| Speedy | 6 | 4 | 2 | 2 |
| Spiffy | 6 | 5 | 1 | 2 |
| Spruce | 6 | 4 | 2 | 1 |
| Spry | 4 | 4 | 0 | 1 |
| Startling | 9 | 7 | 2 | 2 |
| Sudden | 6 | 4 | 2 | 2 |
| Summary | 7 | 5 | 2 | 3 |
| Superficial | 11 | 6 | 5 | 4 |
| Supersonic | 10 | 6 | 4 | 4 |
| Surfacea | 8 | 4 | 4 | 3 |
| Surprising | 10 | 7 | 3 | 3 |
| Swiftly | 7 | 6 | 1 | 2 |
| Tearawaya | 9 | 4 | 5 | 3 |
| Thrilling | 9 | 7 | 2 | 2 |
| Timesaving | 10 | 6 | 4 | 4 |
| Ultrasonic | 10 | 6 | 4 | 4 |
| Unannounced | 11 | 6 | 5 | 3 |
| Unexpected | 10 | 6 | 4 | 4 |
| Unforeseen | 10 | 5 | 5 | 4 |
| Unheralded | 10 | 6 | 4 | 4 |
| Unlooked For | 12 | 7 | 5 | 4 |
| Unlooked For | 12 | 7 | 5 | 4 |
| Unpredicted | 11 | 7 | 4 | 4 |
| Urgent | 6 | 4 | 2 | 2 |
| Warning Signal | 14 | 10 | 4 | 4 |
| Winged | 6 | 4 | 2 | 2 |
| Without Delay | 13 | 8 | 5 | 4 |

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