| Word | Definitions | Synonyms |
|---|---|---|
| outback | (adjective) inaccessible and sparsely populated | Synonyms: remote |
| outboard | (adjective) located away from the midline of a vessel or aircraft | - |
| outbound | (adjective) that is going out or leaving | Synonyms: departing, outward-bound, outward |
| outbred | (adjective) bred of parents not closely related; having parents of different classes or tribes | - |