The word "pedantical" is an adjective that stems form the root word "pedant". The word pedant is an archaism that when it was first used, referred to an overly-bookish academician with a penchant to show off knowledge excessively.
In modern usage, something pedantic refers to anything which denotes qualities of ostentatious behavior. This word, in turn, can mean a diversity of things to be applied depending on the situation. It could be anything from
- the want to appear smarter
Hence, something "pedantical" refers to a person, or action, that try to evoke a sense of over-importance.
Although the adjective "pedantic" is more widely-used than "pedantical" in a sentence, in some cases you can use the worlds interchangeably. For example:
- His behavior is pedantical (simple sentence).
- It would be pedantical to try to act as if you are smarter than what you really are.
- The witness made a pedantic comment about his pedantical demeanor.
Notice how pedantic and pedantical are both adjectives but when "pedantical" is used is more to denote a pattern of behavior rather than a sudden behavior.