Mid 17th century; earliest use found in Richard Montagu (bap. 1575, d. 1641), bishop of Norwich and religious controversialist. From un- + profane + -able.
Definition of unprofanable in US English:
unprofanable
adjective(ˌ)ʌnprəˈfeɪnəbl
That should not or cannot be profaned.
Origin
Mid 17th century; earliest use found in Richard Montagu (bap. 1575, d. 1641), bishop of Norwich and religious controversialist. From un- + profane + -able.