be ‧ liev ‧ a ‧ ble /bəˈliːvəb ə l, bɪˈliːvəb ə l/ BrE AmE adjective
[ Word Family: noun : ↑ belief , ↑ disbelief , ↑ believer ; adjective : ↑ believable ≠ ↑ unbelievable , ↑ disbelieving ; verb : ↑ believe ≠ ↑ disbelieve ; adverb : ↑ unbelievably ]
something that is believable can be believed because it seems possible, likely, or real:
a story with believable characters in it
That scenario is entirely believable.