Meaning of 'Tumult' in Context

In the following passage, the author reflects on the complexity of human emotions, particularly how they can often contradict our logical understanding. The passage states:

'Despite an outward appearance of serenity, the inhabitants of the small town concealed a tumult of conflicting sentiments, torn between nostalgia for their past and the allure of an uncertain future. This juxtaposition laid bare the human condition: forever oscillating between hope and despair, yearning and satisfaction.'

As used in the passage, the word 'tumult' most closely means: