Behavior: behavioral. Devotion: devotional. Shakespeare: Shakesperean.



  • 2
    This really needs context or examples where you might want to use such words as an adjective. I answered below, but it is pretty much a dictionary lookup answer.
    – user3169
    Jul 29, 2016 at 2:21
  • 2
    The compounds faith related and belief related would have to suffice. Some logical adjectival forms seem to have been expropriated by worshippers of deities. This is an interesting question at its root, though. +1 Jul 29, 2016 at 6:05
  • @user3169: "There are three types of evidence: spiritual, "faith ...?" and empirical." How's that for context?
    – Ricky
    Jul 29, 2016 at 17:45

4 Answers 4


Faithful means having faith in the sense of "full of" faith, but it does not mean of faith or having to do with faith like the other words in your example mean.

Probably X of faith is the best you can do.

He took his devotional book ...

He took his book of faith ...

Likewise with belief.


faith-based: adjective
affiliated with or sponsored by a church or other religious organization.
"Let them perform their faith-based magic and put a spell on me-to kill me right here and now." Terry Goodkind NAKED EMPIRE

There is also faithful but the meaning is rather broad, so you would have to check it in context.

belief really doesn't have an adjective form directly, though you could possibly use believable. You might even get away with belief-based though I couldn't find it in a dictionary.


You can say: faithful and reliable


How about "convictional" ? As one of the meaning of it is strong belief. However, it's not a very common word.

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