The Collaborative International Dictionary of English v.0.48:

Workaday \Work"a*day`\, n.
   See Workyday.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Workyday \Work"y*day`\, n. [See Workday, Workingday.]
   A week day or working day, as distinguished from Sunday or a
   holiday. Also used adjectively. [Written also workiday, and
   workaday.] [Obs. or Colloq.]
   [1913 Webster]

         Prithee, tell her but a workyday fortune. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

workaday
    adj 1: found in the ordinary course of events; "a placid
           everyday scene"; "it was a routine day"; "there's nothing
           quite like a real...train conductor to add color to a
           quotidian commute"- Anita Diamant [syn: everyday,
           mundane, quotidian, routine, unremarkable,
           workaday]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "workaday":
   Attic, banausic, breadwinning, businesslike, chaste, classic,
   classical, commercial, common, commonplace, everyday, garden,
   garden-variety, homely, homespun, household, lowly, materialistic,
   matter-of-fact, moneymaking, mundane, nondescript, ordinary, plain,
   practical, prosaic, prosy, pure, pure and simple, quotidian,
   realistic, routine, simple, unremarkable, usual, utilitarian,
   workday, working