sirius

As an adjective serious

is without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn.

As a proper noun sirius is

(star) a bluish-white star in the constellation canis major; alpha (α) canis majoris a vertex of the winter triangle and the brightest star in the night sky it is actually a binary star with a white dwarf companion star.

As a proper noun sirius

is (star) a bluish-white star in the constellation canis major; alpha (α) canis majoris a vertex of the winter triangle and the brightest star in the night sky it is actually a binary star with a white dwarf companion star.

As an adjective canicular is

of or pertaining to the dog days.

As a proper noun sirius

is (star) a bluish-white star in the constellation canis major; alpha (α) canis majoris a vertex of the winter triangle and the brightest star in the night sky it is actually a binary star with a white dwarf companion star.

As an adjective sirian is

(eo-form of).