old-maidish
replace this vague term with a more precise adjective depending on your meaning: particular, fussy, finicky, fastidious, pernickety, set in one's ways, solitary, precise, old-fashioned, repressed, nervous, fearful. These adjectives can be used for both men and women and are associated with unmarried older women only insofar as they convey the inaccurate, stereotypical meaning of "old-maidish."
