Source : Webster's Revised Unabridged Dictionary (1913)

Spasmodical \Spas*mod"ic*al\, a.
   Same as {Spasmodic}, a. -- {Spas*mod"ic*al*ly}, adv.

Source : WordNet®

spasmodically
     adv 1: with spasms; "the mouth was slightly open, and jerked
            violently and spasmodically at one corner" [syn: {jerkily}]
     2: in spurts and fits; "I began to write intermittently and
        spasmodically"