The word for things that cannot be easily explained or understood is "mysterious" or "unfathomable".
Mysteries.
Perpecious means easily understood by the person. For example, the student was perspicuous by the teacher.
Jenny is very contagious, she has the flu.
clearly expressed, lucid, easily understood
an abbreviation means the short form of words which can easily understood by a person with less time cunsumption.ex.around-arnd, teacher-tchr.
Not clearly expressed or easily understood
confusing
Transparent refers to something that is clear, easily understood, or easily seen through. It can describe a material that allows light to pass through without distortion, or a process that is open and easily understood by others.
* Reasoned * Defined * Made Understood * Construed * Explicated * Expounded * Accounted For
enigma
Easily understood or completely intelligible.