| doubt(noun, unstable, unsteady, vibrate) |
| drop arm(noun, thing, equipment, apparatus) |
| dubiety(noun, unstable, unsteady, vibrate) |
| dusting(noun, swing, waver, sea) |
| floating lever(noun, thing, equipment, apparatus) |
| fluctuation(noun, unstable, unsteady, vibrate) |
| fly(noun, thing, equipment, apparatus) |
| hesitance(noun, unstable, unsteady, vibrate) |
| hesitancy(noun, unstable, unsteady, vibrate) |
| hesitation(noun, unstable, unsteady, vibrate) |
| indecision(noun, unstable, unsteady, vibrate) |
| indetermination(noun, unstable, unsteady, vibrate) |
| irresolution(noun, unstable, unsteady, vibrate) |
| jarring(noun, unstable, unsteady, vibrate) |
| jinky board(noun, swing, fluctuate, toy) |
| joggling board(noun, swing, fluctuate, toy) |
| labouring(noun, swing, waver, sea) |
| libration(noun, unstable, unsteady, vibrate) |
| looseness(noun, swing, waver, sea) |
| motions(noun, swing, waver, sea) |