earnest
Frivolous
It can mean: 1. To put an end to. 2. To decide.
irresponsible
The word that means overly serious or lacking in humor is "sombre" (or "somber" in American English). It describes a demeanor or attitude that is grave, serious, or dismal, often devoid of lightness or levity. Another term that conveys a similar meaning is "stern," which implies a strict and serious disposition.
If you are referring to the word which means "not joking", it is spelled "serious" as in, I was "serious" about selling my Shelby GT 500 for only one dollar.
Enraege
earnest
earnest
The word serious is an adjective. It means to be without any humour.
Determined.
The word serious is an adjective. It means to be without any humour.
resolute
Frivolous
It can mean: 1. To put an end to. 2. To decide.
Solemn
Quiet and serios
serious