Doubt is a related term of stickle.
In obsolete|lang=en terms the difference between doubt and stickle
is that
doubt is (obsolete) to fill with fear; to affright while
stickle is (obsolete) to contend, contest, or altercate, especially in a pertinacious manner on insufficient grounds.
As nouns the difference between doubt and stickle
is that
doubt is uncertainty, disbelief while
stickle is (uk|dialect) a shallow rapid in a river.
As verbs the difference between doubt and stickle
is that
doubt is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect while
stickle is (obsolete) to act as referee or arbiter; to mediate.