OK
Roger
absolutely
all right
alright
alrighty
amen
and no mistake
as you say
assuredly
at all events
at any rate
aye
beyond question
by all means
certainly
clearly
confidently
da
decidedly
decisively
definitely
determinedly
distinctly
doggedly
doubtless
doubtlessly
exactly
fatefully
fine
firmly
for a certainty
for a fact
for certain
for sure
forsooth
good
good enough
hear
in truth
indeed
indeedy
indefeasibly
indubitably
ineluctably
inescapably
inevasibly
demurely
prematurely
purely
securely