The term GROOMED ONESELF FASTIDIOUSLY can be summarized by the crossword solution PRIMPED. To primp means to groom oneself carefully and with great attention to detail. It is often used to describe someone who takes a long time to get ready for an event or occasion. Fastidiously means with great care and attention to detail, so when combined, the term GROOMED ONESELF FASTIDIOUSLY means to take great care in grooming oneself.