The Centre Cannot Hold

Mentia
-noun

Notable improvement of intellectual faculties, such as memory, concentration, and judgment. It is sometimes accompanied by an ending or lessening of emotional disturbance and beneficial personality changes.
An ordinary or average degree of sanity.

Mential
-adjectival form of Mentia.

No doubt we are all aware of the verb overwhelm (and its back-formation and antonym, underwhelm). But as Bianca Stratford so rightly pointed out (in “10 Things I Hate About You“), there is no such word as whelm.
Until now.
Whelm
–verb (used with object)

to fail to affect
to fight to a draw
to give a sufficiency, no more [...]

I don’t know about the rest of you, but the general inconsistency of English has always bothered me. Especially with regard to prefixes, suffixes and infixes. There are so many words that exist in only one form where there should be more. Prefixes are the worst offenders in this regard - a [...]