unsteadfast (?.)
- adrift
- afloat
- alternating
- amorphous
- capricious
- changeable
- changeful
- dangerous
- derelict
- desultory
- deviable
- disaffected
- disloyal
- dizzy
- eccentric
- erratic
- faithless
- false
- fast and loose
- fickle
- fitful
- flickering
- flighty
- flitting
- fluctuating
- freakish
- giddy
- hazardous
- impetuous
- impulsive
- inconsistent
- inconstant
- indecisive
- infirm
- insecure
- insubstantial
- irregular
- irresolute
- irresponsible
- mazy
- mercurial
- mobile
- moody
- moving
- not true to
- of bad faith
- perilous
- precarious
- provisional
- rambling
- recreant
- restless
- risky
- roving
- scatterbrained
- shaky
- shapeless
- shifting
- shifty
- shuffling
- slippery
- spasmodic
- spineless
- temporary
- tentative
- ticklish
- treacherous
- trothless
- unaccountable
- uncertain
- uncontrolled
- undependable
- undisciplined
- unfaithful
- unfaithworthy
- unfixed
- unloyal
- unpredictable
- unreliable
- unrestrained
- unsettled
- unsolid
- unsound
- unstable
- unstable as water
- unstaid
- unsteady
- unsubstantial
- unsure
- untrue
- untrustworthy
- vacillating
- vagrant
- variable
- vicissitudinary
- vicissitudinous
- volatile
- wandering
- wanton
- wavering
- wavery
- wavy
- wayward
- whimsical
- wishy-washy
