The regular adjective is sub-classified into two types: those where the adverbial form ends in -ku and those that end in -siku.

Even the word itself was rare, except in its adverbial form, as in "happily humbled"; expressions like "peace of conscience" or "comfort of heart" were more common.

In Celtic languages, an adverbial form is often made by preceding the adjective with a preposition.

The adverbial form 'boustrophedonically' is also found (hackers purely love constructions like this).

Colloquially, virtual is used to mean almost, particularly when used in the adverbial form e.g. "That's virtually [almost] impossible".

A possibility is an adverbial form of "pentir," meaning to repent of, as in the sense of regret.

Rumsfeld also uses it in an adverbial form modifying an affirmative.

But in the adjectival and adverbial forms, purported and purportedly mean "supposed" and "supposedly" - seeming to be so, but not necessarily.

This distinction is faithfully reflected in the use of pronominal adverbs, and other pronouns also often have a corresponding adverbial form.

However, sparse remnants of the earlier locative and ablative cases are visible in a few pronominal and adverbial forms.