The Collaborative International Dictionary
Hobbyhorsical
Hobbyhorsical \Hob`by*hors"ic*al\, n.
Pertaining to, or having, a hobby or whim; eccentric;
whimsical.[Colloq.]
--Sterne.
Wiktionary
hobbyhorsical
a. (context colloquial English) Pertaining to, or having, a hobby or whim; eccentric; whimsical.