disappointer means one who or that which disappoints (all senses).
Etymology
From disappoint + -er.
noun
- One who or that which disappoints (all senses).“1671, Robert McWard, The Case of the Accommodation Lately Proposed by the Bishop of Dumblane, Letter 1, Post-Script, p. 102,
Oh when shall the loud and harsh noises of our debates be turned to the sweeter sound of united prayers for this blessed peace […] and if we be real supplicants for it, we would bewar of being the disappointers of our own desires, and of obstructing the blessing we pray for,”