adj. & pron. 1 = WHAT (in relative uses) with the emphasis on indefiniteness (lend me whatever you can; whatever money you have). 2 though anything (we are safe whatever happens). 3 (with neg. or interrog.) at all; of any kind (there is no doubt whatever). 4 colloq. = what ever. or whatever colloq. or anything similar.
WHATEVER
Meaning of WHATEVER in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012