A fastidious person is someone who is extremely particular and meticulous in their habits and behavior. They are often described as fussy, or a 'FUSSPOT', as the first crossword solution suggests. They also tend to be purists, meaning they have very strict standards and expectations for themselves and others. An EPICURE is someone who is devoted to the pursuit of pleasure, especially in regards to food and drink, and a PRUDE is someone who is excessively modest or proper in their behavior. All of these terms describe someone who is very particular and exacting in their habits and behavior.