The term 'not messy' can be described by three crossword solutions: KEMPT (5 letters), NEAT (4 letters), and TIDY (4 letters). KEMPT is an adjective meaning 'well-groomed and TIDY in appearance, ' while NEAT is an adjective meaning 'carefully arranged or organized; orderly.' TIDY is an adjective meaning 'NEAT and in order; well-organized.' All three words are synonyms for the term 'not messy, ' and they all imply a sense of neatness and organization.