thinkable

adjectives

capable of being conceived or imagined or considered
thinkable
antonym
unthinkable
is similar to
capable of being thought about
"space flight to other galaxies becomes more cogitable"
cogitable, ponderable
is similar to
capable of being imagined
"that is one possible answer"
conceivable, imaginable
is similar to
capable of being inferred on slight grounds
presumable, supposable, surmisable
see also
capable of being believed
"completely credible testimony"; "credible information"
believable, credible
see also
capable of happening or existing
"a breakthrough may be possible next year"; "anything is possible"; "warned of possible consequences"
possible