| flimsy(adjective, weak, delicate, uncertain, ill) |
| fluctuant(adjective, weak, uncertain, nervous, unstable) |
| fluidity(noun, anxiety, weakness, uncertainty, shake) |
| foolish |
| frailty(noun, anxiety, weakness, uncertainty, shake) |
| glimmering(verb, adjective, flickering) |
| growing(adjective, changing, varying, mind-blowing, altering) |
| hemming and hawing(noun, expression, adjective, idiom, open) |
| hovering |
| ill-defined |
| immaturity(noun, anxiety, weakness, uncertainty, shake) |
| imperceptible |
| impermanence(noun, anxiety, weakness, uncertainty, shake) |
| impulsive(adjective, unstable, irregular, unsettled, unpredictable) |
| incalculable(doubtful, vague, hesitant, changeable, unsure) |
| inconsistency(noun, anxiety, weakness, uncertainty, shake) |
| indiscernible |
| inquietude(noun, anxiety, weakness, uncertainty, shake) |
| insecurity(noun, anxiety, weakness, confusion, doubt) |
| intermittent(adjective, irregular, changeable, variable) |