| dubious(adjective, doubt, varying, oscillating, wobbling) |
| dusty(adjective, uncertain, unclear, unbalanced, indefinite) |
| each-way(adjective, uncertain, unclear, unbalanced, indefinite) |
| erratic(adjective, doubt, varying, oscillating, wobbling) |
| faint-hearted(adjective, doubt, unstable, shy, unready) |
| faint hearted(adjective, doubt, unstable, shy, unready) |
| fearful(adjective, doubt, unstable, shy, unready) |
| feeble minded(adjective, doubt, unstable, shy, unready) |
| fence-hanger(adjective, uncertain, doubtful, dubious) |
| flaccid(adjective, doubt, unstable, shy, unready) |
| flexuous(adjective, doubt, varying, oscillating, wobbling) |
| float(adjective, shaky, floating, pivoting) |
| fluctuated(adjective, doubt, varying, oscillating, wobbling) |
| fluctuation(adjective, unstable, erratic, unsteady) |
| foundationless(adjective, shake, unstable, unsteady) |
| frail(adjective, unstable, erratic, unsteady) |
| fuzzy(adjective, uncertain, unclear, unbalanced, indefinite) |
| going back and forth(adjective, unstable, doubtful, vacillating) |
| groggy(adjective, shake, unstable, unsteady) |
| half-and-half(adjective, doubt, unstable, shy, unready) |