erratic
fallible
temperamental
uncertain
unsound
adrift
afloat
alternating
amorphous
capricious
changeable
changeful
coquettish
dangerous
desultory
deviable
dizzy
doubtful
dubious
eccentric
faddish
fast and loose
fickle
fitful
flickering
flighty
flirtatious
flitting
fluctuating
fly-by-night
freakish
giddy
hazardous
impetuous
impulsive
inconsistent
inconstant
indecisive
infirm
insecure
insubstantial
irregular
irresolute
irresponsible
light
mazy
mercurial
moody
perilous
precarious
provisional
quicksilver
rambling
restless
Rubenesque
apolitical
connectionless
earthquake-created
fallacious
intransigent
luxury-loving
money-lending
organian
re-written
thriftless
tightfisted
unadvised
unconscientious
unconvinced
unflappable
unmemorable
unsteadfast
untrustworthy
untruthful
unusable
unwatchful
vagarious
dependable