The Collaborative International Dictionary of English v.0.48:

Behindhand \Be*hind"hand`\, adv. & a. [Behind + hand.]
   [1913 Webster]
   1. In arrears financially; in a state where expenditures have
      exceeded the receipt of funds.
      [1913 Webster]

   2. In a state of backwardness, in respect to what is
      seasonable or appropriate, or as to what should have been
      accomplished; not equally forward with some other person
      or thing; dilatory; backward; late; tardy; as, behindhand
      in studies or in work.
      [1913 Webster]

            In this also [dress] the country are very much
            behindhand.                           --Addison.
      [1913 Webster]

WordNet (r) 3.0 (2006):

behindhand
    adv 1: in debt; "he fell behind with his mortgage payments"; "a
           month behind in the rent"; "a company that has been run
           behindhand for years"; "in arrears with their utility
           bills" [syn: behind, behindhand, in arrears]
    adj 1: behind schedule; "was behindhand with the rent"

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "behindhand":
   after time, ahead of time, anachronistic, antedated, arrested,
   back, backward, beforehand, behind, behind time, belated,
   belatedly, blocked, careless, dated, deep into, defaulting,
   delayed, delayed-action, delinquent, derelict, detained,
   disregardful, early, far on, foredated, held up, hung up,
   in a bind, in abeyance, in arrear, in arrears, jammed, late,
   latish, lax, metachronistic, misdated, mistimed, moratory,
   neglectful, never on time, none too soon, nonpaying, obstructed,
   out of date, out of season, overdue, parachronistic, past due,
   postdated, prochronistic, regardless, remiss, retarded, slack,
   slow, stopped, tardy, underdeveloped, undeveloped, unprogressive,
   unpunctual, unready, unseasonable, untimely