We create a monument to remember some kind of great event or person. When something is described as being "monumental," that thing is being noted for its importance. In contrast to this, "trifling" means trivial or unimportant. "Trifles" are small and unimportant matters.

When something is trite, it is overused or repeated to the point of being of little worth or help. For instance, a trite expression is one that is so common that everyone knows it; therefore, it helps very little even to repeat it. In contrast to this, something that is "consequential" is important—as though it were something "having great consequences".

The adjective "elementary" means simple or pertaining to the elements (i.e. the basic parts). We call the first stage of education "elementary school" because it represents the place where beginning concepts are taught. In contrast to such simple matters, an "intricate" problem or affair is something that is complex and difficult.