The Collaborative International Dictionary
Monotonical
Monotonic \Mon`o*ton"ic\, Monotonical \Mon`o*ton"ic*al\, a.
Of, pertaining to, or uttered in, a monotone; monotonous. ``Monotonical declamation.''
--Chesterfield.(Math.) Always increasing or always decreasing, as the value of the independent variable increases; -- of a function.
Wiktionary
monotonical
a. monotonic