| Answer | Crossword Clue |
|---|---|
| SINE | Wave that can't be ridden |
| LLAMA | Animal that can be ridden |
| unridable | that cannot be ridden also UNRIDEABLE |
| unrideable | that cannot be ridden also UNRIDABLE |
| LAME | Like a horse that can no longer be ridden |
| complementarity | The concept that two contrasted theories, such as the wave and particle theories of light, may be able to explain a set of phenomena, although each separately only accounts for some aspects |
