extemporaneously
unpremeditatedly
off the top of one's head
impromptu
unawares
offhanded
unimprovised
unpremeditated
forethoughtless
unthoughtedly
on the hoof
ad-libbed
extemporaneous
extemporise
off-the-cuff
extempore
unplannedly
unplanned
unprovoked
ad lib
intuitive
offhand
businesslike
unconscious
nonautomatically
unprophetically
plainly
simply
unimaginatively
cold
occasionless
think little of
nuanceless
unanticipatingly
extemporize
unagitatedly
unnecessarily
idly
involuntarily
nonjudgmentally
fall into
currente calamo
any old how
unpunctually
nonintentionally
indeliberate
all dressed up and nowhere to go
uninvolvedly
freeball
undreamingly