The phrase "absolute falsehood" means something that is completely untrue and not based on any facts or evidence. It suggests that there is no element of truth in the statement or information being referred to. Full definition
«It is absolute falsehood for anybody to suggest that proposals have been sent to Parliament for a reversal of the one percent withholding tax on the interest, it can't be! (ghanapoliticsonline.com)
The Force rejects the report as unempirical and absolute falsehood, should be disregarded and discountenanced», said the police in a preface to their statement of objection to the report. (nigeriapoliticsonline.com)
Unfortunately, this first film is a mess of a project, focusing on Churchill's lack of support of D - Day which is not just creative license, but apparently an absolute falsehood. (crunchonthis.com)