These names are almost always of the adjectival form.

Mature is the adjectival form of maturity, which has several meanings.

Their adjectival forms are all written with lower case.

The uppercase letter of the beginning element is kept even in an adjectival form.

The adjectival form of the word is testamentary, as in:

The correct adjectival form of the moon's name is Tethyan, although other forms are also used.

Although the word "Australia" had been used on occasion, this is the first known use of the adjectival form.

Tidal is the adjectival form of the word tide.

It is also possible to use the normal adjectival form.

Progressive is an adjectival form of progress and may refer to: