Which word describes someone who is excessively fastidious and easily disgusted?

The term that best describes someone who is excessively fastidious and easily disgusted is "picky." This word captures the essence of being overly particular or choosy, often to the point of being difficult to please. A person who is described as picky likely has high standards or strict preferences that can make them seem fussy or hard to satisfy.

While "nice" often pertains to someone who is agreeable or pleasant, it does not convey the nuances of fastidiousness or disgust related to cleanliness, order, or taste. "Displeased" refers to a state of unhappiness, and "critical" suggests an evaluative approach, focusing on judgment rather than the specific sense of being excessively particular about one's preferences. Hence, "picky" accurately reflects the qualities of being fussy and easily grossed out.