| devil-may-care(adjective, madcap, feckless, unaccountable, irresponsive) |
| dishonest(adjective, bad, wrong, false, immoral) |
| fair-weather(adjective, dishonest, deceitful, unreliable, insecure) |
| faithless(adjective, false, dishonest, deceitful, unreliable) |
| fallible(adjective, unpredictable, unreliable, fickle, variable) |
| fanciful(adjective, light, weak, slight, imaginary) |
| feckless(adjective, madcap, unaccountable, irresponsive) |
| flighty(adjective, careless, immoral, thoughtless, reckless) |
| fly by night(adjective, unreliable, insecure, treacherous, incalculable) |
| flying |
| fragile(light, weak, slight, imaginary, flimsy) |
| frail(light, weak, slight, imaginary, flimsy) |
| hesitant(adjective, uncertain, nervous, doubtful, insecure) |
| inconsistent(adjective, loose, unpredictable, unreliable, variable) |
| infirm(adjective, light, weak, slight, imaginary) |
| irresolute(adjective, uncertain, nervous, doubtful, insecure) |
| makeshift(adjective, unpredictable, fickle, variable, spontaneous) |
| provisional |
| quick(adjective, transient, transitory, short-lived) |
| reckless(adjective, madcap, feckless, unaccountable, irresponsive) |