determinedly recklessly, in a manner that lacks restraint.
Synonym of hell-bent (“(recklessly) determined”)
Synonym of hell-for-leather (“very fast”)
In a serious manner; seriously.
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
Important; weighty; not insignificant