noun, noun which may take the genitive case particle 'no'
innocence; guiltlessness; false accusation
Common in legal, news, and everyday contexts for not having committed an alleged crime or wrong. Often appears in 無実を訴える, 無実が証明される, and 無実の罪, where it can imply a false charge.
He insisted on his innocence to the end.
The new evidence proved her innocence.
He was arrested on a false charge.
absence of fact; lack of substance; insubstantiality
A much less common abstract use meaning that something has no factual basis or no real substance. In modern Japanese this is usually encountered in explanatory or literary contexts rather than ordinary conversation.
In this context, 無実 refers to the absence of the fact itself.
Archaic noun use for lack of sincerity or honesty. This is not the normal modern meaning, so contemporary readers are more likely to understand 無実 as 'innocence' unless the older sense is explicitly discussed.
In old writing, 無実 can mean insincerity or falsehood.
He pleaded his innocence in court.
New evidence proved his innocence.
He was arrested on a false charge.
The lawyer tried to prove his innocence.