mercurial (adj.)
- active
- activist
- activistic
- adrift
- adroit
- afloat
- agile
- alive
- alternating
- ambivalent
- amorphous
- animated
- aureate
- bouncing
- bouncy
- brassy
- brazen
- breakneck
- breezy
- brisk
- bronze
- bronzy
- bubbly
- buoyant
- capricious
- changeable
- changeful
- changing
- chipper
- choppy
- clever
- coppery
- coquettish
- cunning
- cuprous
- dashing
- desultory
- deviating
- different
- disorderly
- divergent
- diversified
- dizzy
- double-quick
- dubious
- ebullient
- eccentric
- effervescent
- elastic
- energetic
- erose
- erratic
- expansive
- expeditious
- express
- faddish
- fast
- ferrous
- fickle
- fitful
- fleet
- flickering
- flighty
- flirtatious
- fluctuating
- flying
- freakish
- frisky
- giddy
- gilt
- gold
- golden
- hasty
- headlong
- impetuous
- impulsive
- inconsistent
- inconstant
- indecisive
- infirm
- ingenious
- iron
- ironlike
- irregular
- irresolute
- irresponsible
- jagged
- jerky
- lead
- leaden
- light
- light-footed
- live
- lively
- lubricious
- mazy
- mercurous
- militant
- mobile
- moody
- motley
- movable
- mutable
- nimble
- nonconformist
- nonstandard
- nonuniform
- peppy
- perky
- pert
- pluralistic
- precipitate
- prompt
- quick
- quicksilver
- ragged
- rambling
- rapid
- reckless
- resilient
- restless
- rough
- roving
- running
- scatterbrained
- shapeless
- shifting
- shifty
- silver
- silvery
- skittish
- snappy
- spanking
- spasmodic
- speedy
- spineless
- spirited
- sporadic
- sprightly
- spry
- steely
- swift
- temperamental
- ticklish
- tin
- tinny
- unaccountable
- uncertain
- uncontrolled
- undecided
- undependable
- undetermined
- undisciplined
- unequal
- uneven
- unfixed
- unorthodox
- unpredictable
- unreliable
- unresolved
- unrestrained
- unsettled
- unstable
- unsteady
- unsystematic
- vacillating
- vagrant
- variable
- variegated
- variform
- various
- varying
- versatile
- vivacious
- volatile
- wandering
- wanton
- wavering
- wavy
- wayward
- whimsical
- winged
- wishy-washy
