The Collaborative International Dictionary of English v.0.48:

Smittle \Smit"tle\ (sm[i^]t"t'l), Smittlish \Smit"tlish\
   (-tl[i^]sh), a.
   Infectious; catching. [Scot. & Prov. Eng.] --H. Kingsley.
   [1913 Webster]