Dissatisfied means not content with what you have been given. It fell short, and you are saying so.
It takes with. The word is more formal and more measured than unhappy, which is why complaints and surveys use it: dissatisfied customers, dissatisfied with the response. It implies a specific shortfall rather than general misery. Its opposite, satisfied, means merely content rather than delighted, so the pair sit closer together than they look. The noun is dissatisfaction, and it usually appears as expressing dissatisfaction.
1adjectivedissatisfiedNot content because expectations were not met.
“Customers were dissatisfied with the explanation.”
Middle English
satisfyed
English
satisfied
English, today
dissatisfied
From dis- + satisfied. satisfied comes from Middle English satisfyed, from satisfien. From Middle English satisfyed, i-satisfyed, i-satisfied, past participle of Middle English satisfien, equivalent to satisfy + -ed.
Etymology from Wiktionary, CC BY-SA