It is a scandal that the murderer was declared innocent.

Rumour : a currently circulating story or report of uncertain or doubtful truth.
Silly : having or showing a lack of common sense or judgement; absurd and foolish.
Talk : speak in order to give information or express ideas or feelings; converse or communicate by spoken words.
Impropriety : failure to observe standards of honesty or modesty; improper behaviour or character.
Scandal : an action or event regarded as morally or legally wrong and causing general public outrage.

Synonym of Scandal is Impropriety