patroness

As a noun patroness

is a woman who sponsors or supports a given activity, person etc; a female patron.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between matron and patroness

is that matron is a mature woman; a wife or a widow, especially, one who has borne children; a woman of staid or motherly manners while patroness is a woman who sponsors or supports a given activity, person etc.; a female patron.

As an adjective patronless

is lacking a patron or patrons; unsponsored; unpatronized; unpatroned.

As a noun patroness is

a woman who sponsors or supports a given activity, person etc; a female patron.