Whatever. The definition of whatsoever is whatever. An example of whatsoever used as an adjective is in the phrase, "no decision whatsoever," which means no decision was made.

Is whatsoever and whatever same?

They mean the same - they both add emphasis. Whatsoever sounds more emphatic than whatever, but do you really need the extra emphasis? Whatever is in fact what educated writers in past centuries, like Churchill, mostly used. Whatsoever is mostly colloquial or American.

What does it mean by whatsoever?

Definitions of whatsoever. adjective. one or some or every or all without specification. “no milk whatsoever is left” synonyms: any, whatever some.