| extreme(leading-edge, pioneering, trailblazing) |
| fair(adjective, clear, pleasant, sharp, bright) |
| faithful(pure, innocent, virtuous) |
| first(leading-edge, pioneering, trailblazing) |
| firsthand(adjective, fresh, original, novel, innovative) |
| florid(adjective, pleasant, wholesome, unpolluted, airy) |
| foremost(leading-edge, pioneering, trailblazing) |
| forward(leading-edge, pioneering, trailblazing) |
| forward-looking(leading-edge, pioneering, trailblazing) |
| front-line(leading-edge, pioneering, trailblazing) |
| genuine(adjective, clean, wholesome, unpolluted, unadulterated) |
| glowing(adjective, pleasant, wholesome, unpolluted, airy) |
| graceful(adjective, fresh, sparkling, unpolluted, spotless) |
| guileless |
| guiltless(adjective, innocent, unadulterated, unspoiled, chaste) |
| hardy(adjective, pleasant, wholesome, unpolluted, airy) |
| healthy(adjective, pleasant, clean, wholesome, unpolluted) |
| higher(leading-edge, pioneering, trailblazing) |
| honest |
| inculpable |