| collar(noun, attire, frill, choker, fraise) |
| dangerous |
| dicey |
| dodgy |
| dubious(adjective, unreliable, insecure, treacherous, incalculable) |
| error-prone(adjective, unreliable, insecure, treacherous, incalculable) |
| fair-weather(adjective, unreliable, insecure, treacherous, incalculable) |
| fairweather(adjective, unreliable, insecure, treacherous, incalculable) |
| faithless(adjective, unreliable, insecure, treacherous, incalculable) |
| fallible(adjective, unreliable, insecure, treacherous, incalculable) |
| fast and loose(adjective, unreliable, insecure, treacherous, incalculable) |
| fichu(noun, frill, collar, choker, ruff) |
| fly-by-night(adjective, unreliable, insecure, treacherous, incalculable) |
| fly by night(adjective, unreliable, insecure, treacherous, incalculable) |
| fraise(noun, frill, collar, choker, ruff) |
| hairy |
| hopeless(adjective, unreliable, insecure, treacherous, incalculable) |
| iffy(adjective, unreliable, insecure, treacherous, incalculable) |
| impaired |
| incalculable(adjective, unreliable, insecure, treacherous) |