The Collaborative International Dictionary of English v.0.48:

Fractious \Frac"tious\, a. [Cf. Prov. E. frack forward, eager,
   E. freak, fridge; or Prov. E. fratch to squabble, quarrel.]
   Apt to break out into a passion; apt to scold; cross;
   snappish; ugly; unruly; as, a fractious man; a fractious
   horse.

   Syn: Snappish; peevish; waspish; cross; irritable; perverse;
        pettish. -- Frac"tious*ly, v. -- Frac"tious*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

fractiously
    adv 1: in a peevish manner [syn: peevishly, querulously,
           fractiously]
    2: in a fractious manner; "the horse was behaving fractiously
       and refused to jump"