Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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