The Collaborative International Dictionary of English v.0.48:

old-maidish \old`-maid"ish\, a.
   Like an old maid; prim; precise; particular; overly
   fastidious.

   Syn: fussy, old-womanish.
        [1913 Webster]

WordNet (r) 3.0 (2006):

old-maidish
    adj 1: primly fastidious [syn: old-maidish, old-womanish]