fastuous

As a noun terms

is .

As an adjective fastuous is

(obsolete) proud; haughty; disdainful.

As adjectives the difference between fastuous and fatuous

is that fastuous is (obsolete) proud; haughty; disdainful while fatuous is obnoxiously stupid, vacantly silly, content in one's foolishness.

Fastuousness is a related term of fastuous.

As an adjective fastuous is

(obsolete) proud; haughty; disdainful.

As adjectives the difference between disdainful and fastuous

is that disdainful is showing contempt or scorn; having a pronounced lack of concern for others viewed as unworthy while fastuous is (obsolete) proud; haughty; disdainful.

As adjectives the difference between haughty and fastuous

is that haughty is conveying in demeanour the assumption of superiority; disdainful, supercilious while fastuous is (obsolete) proud; haughty; disdainful.

In obsolete terms the difference between proud and fastuous

is that proud is   Excited by sexual desire; (of female animals) in heat while fastuous is proud; haughty; disdainful.

As adjectives the difference between proud and fastuous

is that proud is gratified; feeling honoured (by something); feeling satisfied or happy about a fact or event while fastuous is proud; haughty; disdainful.