Yes it is.
It gives you quite a boost when doing it.
The superlative of "believable" is "most believable."
I think the story about his parents is believable.
Drum-Believable was created in 2005.
more believable, most believable
I find it believable that Mark could have written that anonymous letter.
You have to have believable, logical characters who would have believable dynamics first. Then, you just put them together and write out what they'd do in that situation. If your characters are "real people" with backstory and emotion and personality, your dynamics will be believable.
Some words that can be made using the letters of "believable" are:BelieveAliveBibleLabelLeaveLevelVillaBailBall
believable
What_is_initial_credibility
believable
not believable
Something that is credible.