(of an adjective) Describing a quality that cannot normally be varied because it is extreme (e.g. freezing), absolute (e.g. dead), or classification (e.g. nuclear).
That cannot be graded.
Any adjective that is not gradable.
Important; weighty; not insignificant
Committed.
Without humor or expression of happiness; grave in manner or disposition
Really intending what is said (or planned, etc); in earnest; not jocular or deceiving
In a serious manner; seriously.