Of any kind; to any extent.
[Middle English: originally as the phrase so ever.]
The only word containing that is at all common is whatsoever, now usually combined with a negative to indicate an emphatic sense of ‘nothing at all’ (I have no doubt whatsoever). Others are either archaic (whichsoever, whithersoever) or very formal (howsoever, whomsoever). Several have been replaced by shorter forms (whoever is usually preferred to whosoever, whenever to whensoever, wherever to wheresoever) except in very formal situations.