The Collaborative International Dictionary of English v.0.48:

Askance \A*skance"\, Askant \A*skant"\, adv. [Cf. D. schuin,
   schuins, sideways, schuiven to shove, schuinte slope. Cf.
   Asquint.]
   Sideways; obliquely; with a side glance; with disdain, envy,
   or suspicion.
   [1913 Webster]

         They dart away; they wheel askance.      --Beattie.
   [1913 Webster]

         My palfrey eyed them askance.            --Landor.
   [1913 Webster]

         Both . . . were viewed askance by authority.
                                                  --Gladstone.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

askant \askant\ adj.
   1. toward the side, rather than directly ahead; -- used of a
      glance.

   Syn: askance, sidelong.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

askant
    adj 1: (used especially of glances) directed to one side with or
           as if with doubt or suspicion or envy; "her eyes with
           their misted askance look"- Elizabeth Bowen; "sidelong
           glances" [syn: askance, askant, asquint, squint,
           squint-eyed, squinty, sidelong]