| Solution | Length | |
|---|---|---|
| 4 letters | ||
| irov | 4 | |
| snap | 4 | |
| 5 letters | ||
| unbid | 5 | |
| adlib | 5 | |
| 6 letters | ||
| staged | 6 | |
| forced | 6 | |
| reflex | 6 | |
| improv | 6 | |
| 7 letters | ||
| studied | 7 | |
| natural | 7 | |
| instant | 7 | |
| unasked | 7 | |
| WILLFUL | 7 | |
| planned | 7 | |
| WILLING | 7 | |
| 8 letters | ||
| UNSOUGHT | 8 | |
| habitual | 8 | |
| UNFORCED | 8 | |
| unbidden | 8 | |
| 9 letters | ||
| voluntary | 9 | |
| intrinsic | 9 | |
| UNPLANNED | 9 | |
| reflexive | 9 | |
| impulsive | 9 | |
| impromptu | 9 | |
| UNSTUDIED | 9 | |
| UNLEARNED | 9 | |
| uninvited | 9 | |
| uncoerced | 9 | |
| volunteer | 9 | |
| UNADVISED | 9 | |
| automatic | 9 | |
| PROFFERED | 9 | |
| 10 letters | ||
| combustion | 10 | |
| GRATUITOUS | 10 | |
| UNPROMPTED | 10 | |
| unrequired | 10 | |
| UNDESIGNED | 10 | |
| 11 letters | ||
| UNPRESSURED | 11 | |
| unsolicited | 11 | |
| unconscious | 11 | |
| unrequested | 11 | |
| unrehearsed | 11 | |
| uncompelled | 11 | |
| self acting | 11 | |
| 12 letters | ||
| uncalled-for | 12 | |
| self-evolved | 12 | |
| undeliberate | 12 | |
| self winding | 12 | |
| UNCONSIDERED | 12 | |
| uncalculated | 12 | |
| uninfluenced | 12 | |
| 13 letters | ||
| SEMIAUTOMATIC | 13 | |
| unintentional | 13 | |
| 14 letters | ||
| UNPREMEDITATED | 14 | |
| self adjusting | 14 | |
| self governing | 14 | |
| self-generated | 14 | |
| 15 letters | ||
| self-originated | 15 | |
| self regulating | 15 | |
| self-controlled | 15 | |
| self determined | 15 | |