Near-synonyms: disheartening; see also Thesaurus:disheartening
noun
discouragement
August 6, 1841, Lydia Ann Barclay, letter to J. B.
But, alas! I fear the health of the better part is dwindling instead of increasing, through letting in the enemy's discouragings, and a want of feeling after the daily sap of life, whereby strength would be received to overcome all obstacles […]