Obtuse

I invented a new word
without intending anything.
My student spied it lurking in the geometry.
 
The word was obuste,
pronounced “o-boost,”
adjective.
 
To expose such a word
in a classroom setting
was obtuse
 
of me since obuste
connotes the adult
and not school appropriate.

             As in typical meaning 1 …
             something bodacious
             yet at the same time busted.
 
                           Ex: “Monsieur, was your dalliance
                           with the Comtesse
                           satisfyingly obuste?”
 
Or typical meaning 2 ...
something irritatingly obvious
to all of us.
 
                           Ex: “Isn’t the fact
                          that we don’t want to study math
                          this late in the spring perfectly obuste to you too?

No matter.
The students loved it.
Even the quietest,

a girl who raised her hand ever so politely
to respond that yes, the two interior angles
were both obuste.