The suffix -erwize creates adverbs from other adverbs, i.e. adverbially used adjectives and present participles. Examples are given in the table below:

Base form	Derivation
normaalnormal/normally	normalerwizenormally
foarsichtichcareful	foarsichtigerwizecarefully
oanfallendoffensive	oanfallenderwizeoffensively
boartsjendplaying	boartsjenderwizewithout effort
earlikhonest/honestly	earlikerwizehonestly
begryplikunderstandable/understandably	begryplikerwizein an understandable way
fatsoenlikdecent/decently	fatsoenlikerwizedecently
minsklikhuman/humanly	minsklikerwizehumanly
dúdlikclear/clearly	dúdlikerwizeclearly
reedlikrational/rationally	reedlikerwizerationally
foarsichtichcareful/carefully	foarsichtigerwizecarefully
freegjendinterrogative/interrogatively	freegjenderwizeinquiringly
roljendrolling/rollingly	roljenderwizein a rolling way

The base forms are complex, that is, they contain a suffix. Usually, this is the ending of the present participle -end or the suffixes -ich or -lik. This may be an important difference with the suffix -wei, which can also be attached to monosyllabic words.

The suffix -erwize carries the meaning ‘in a manner indicated by the base form’. This reflects its etymological relationship with the noun wizemanner. The main semantic roles of the adverbs are those of qualification, modality, and evaluation. The usual way to express a manner in Frisian is by using the suffix -wei. Often, a derivation with -erwize has a Dutch flavour. A subtle semantic difference might furthermore be that -wei also involves a time aspect: it implies that the manner has persisted during the whole of the action. This aspect seems to be lacking with respect to -erwize.

The suffix preserves the main stress location of its base word (EARlikhonest/honestly > EARlikerwizehonestly); the second syllable of the suffix [vi:] carries secondary stress. The prosodic structure of the adverbs is such that each consists of two prosodic words. The first one is formed by the base + the part -er-, whereas -wiis/-wize forms the second prosodic word, as in /(moγləkər)(υizə)/.

When the base form ends in a voiceless consonant, this becomes voiced before -erwize: lokkich[lokəx]lucky > lokkigerwize[lokəɣərvi:zə]luckily, boartsjend[bṷatsjənt]playing > boartsjenderwize[bṷatsjəndərvi:zə]effortlessly.

Adverbs in -erwize cannot be input for further derivation.