[syn: offhand, offhanded, offhandedly]
The Collaborative International Dictionary of English v.0.48:
offhanded \offhanded\ adj.
   1. same as offhand and off-the-cuff.
   Syn: ad-lib, extemporaneous, extemporary, extempore, offhand,
        off-the-cuff, unpremeditated, unrehearsed.
        [WordNet 1.5]
   2. Without, or seeming to be without, plan or method; casual.
   Syn: casual, offhand.
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
offhanded
    adv 1: without previous thought or preparation; "couldn't give
           the figures offhand"; "we decided offhand to go to
           Canada"; "she had made these remarks offhandedly" [syn:
           offhand, offhanded, offhandedly]
    2: in a casually inconsiderate manner; "replied offhand, his
       mind a million miles away"; "she threw him over offhandedly
       without even a Dear-John letter" [syn: offhand,
       offhanded, offhandedly]
    adj 1: with little or no preparation or forethought; "his ad-lib
           comments showed poor judgment"; "an extemporaneous piano
           recital"; "an extemporary lecture"; "an extempore skit";
           "an impromptu speech"; "offhand excuses"; "trying to
           sound offhanded and reassuring"; "an off-the-cuff toast";
           "a few unrehearsed comments" [syn: ad-lib,
           extemporaneous, extemporary, extempore,
           impromptu, offhand, offhanded, off-the-cuff,
           unrehearsed]
    2: casually thoughtless or inconsiderate; "an offhand manner";
       "she treated most men with offhand contempt" [syn: offhand,
       offhanded]