Synonyms of disgruntlement

2 Syllables
letdowns, letdown, chagrins, chagrin
3 Syllables
chagrinned, chagrining, frustration, frustrations, discontent
4 Syllables
nonfulfillment, unfulfillment, discontentment, disenchantment, anti-climax, displeasure, querulousness, malcontentment
5 Syllables
disillusionment, dissatisfaction, discontentedness, dissatisfactions