poilu

n. logic, good-sense, the ability to perceive and/or utilize empirical thinking in an efficient train of thought.

This word has a special meaning to Tulvans. It is in fact used about sentences or thoughts which have sense or are 'logical', but its connotations can also go as far as to use it to assess someone's sanity. Many Tulvans will think not being logical in speech is a kind of madness. This is not to say that they are always logical, but upper classes are disgusted to engage on futile conversations and often will look down to those who do. The motto of the Society of Tulvan Grammarians is:

TUYLV LEVI POILU SIV
Think and speak with logic

A praise among Tulvan scientists is to say that something is 'poilui' or 'logical', as in 'well-formulated according to the rules of logic'. While the academia lingers on in this belief, the youth are starting to think 'ilipoilu' and outside the box, with varying degrees of achievements. The famous phrase 'that is not logical' rendered in Tulvan as:

Ëv si ilipoilu or ëv ilipoilu

Is close to calling someone a liar.