The Collaborative International Dictionary of English v.0.48:

Frumpish \Frump"ish\, a.
   1. Cross-tempered; scornful. [Obs.]
      [1913 Webster]

   2. Old-fashioned, as a woman's dress.
      [1913 Webster]

            Our Bell . . . looked very frumpish.  --Foote.
      [1913 Webster]

WordNet (r) 3.0 (2006):

frumpish
    adj 1: primly out of date; "nothing so frumpish as last year's
           gambling game" [syn: dowdy, frumpy, frumpish]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "frumpish":
   beat-up, bedraggled, blowzy, careless, chintzy, dilapidated, dowdy,
   drabbletailed, draggled, draggletailed, frowzy, frumpy, grubby,
   in rags, informal, loose, lumpen, messy, mussy, negligent,
   out-of-date, outmoded, poky, ragged, raggedy, ruinous, scraggly,
   seedy, shabby, shoddy, slack, slatternly, slipshod, sloppy,
   slovenly, sluttish, sordid, squalid, stodgy, tacky, tattered,
   unkempt, unneat, unsightly, untidy