It is a scandal that the murderer was declared innocent.

silly notion : an opinion or belief, especially one that is wrong or silly.
talk : speak in order to give information or express ideas or feelings; converse or communicate by spoken words
rumour : a currently circulating story or report of uncertain or doubtful truth.
misconduct : unacceptable or improper behaviour, especially by an employee or professional person.
scandal : an action or event regarded as morally or legally wrong and causing general public outrage.


Synonym of scandal is misconduct