A more thorough explanation:

merum

Merum is a Latin word that means "mere" or "naked".

• The merum truth was revealed during the trial.
• The merum facts were presented without any embellishments.

These examples show that merum refers to something that is plain and unadorned, without any extra details or decorations. It is used to describe something that is straightforward and honest, without any hidden meanings or agendas.