insubstantiality (n.)
- airiness
- attenuation
- danger
- delicacy
- dilution
- exiguity
- fineness
- flimsiness
- frailty
- gracility
- hazard
- immateriality
- impalpability
- incorporeality
- infirmity
- insecurity
- instability
- intangibility
- lightness
- mistiness
- peril
- perilousness
- precariousness
- rareness
- rarity
- risk
- riskiness
- shakiness
- shiftiness
- slenderness
- slightness
- slimness
- slipperiness
- speculativeness
- subtlety
- tenuity
- thinness
- treachery
- undependability
- unreality
- unreliability
- unsoundness
- unsteadiness
- untrustworthiness
- vagueness
- wateriness
- weakness
