"tending to inspire," 1878; see inspiration + -al (1). Also "influenced by inspiration" (1839); "pertaining to inspiration" (1888). The adjective was used earlier in spiritualism. Earlier in the sense "tending to inspire" were inspirative (1770), inspiring (1640s).
inspect
inspection
inspector
inspectorate
inspiration
inspirational
inspire
inspired
inspirer
inspissate
inspissation