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