Person in it can be trusted. It is said of a person honest, truthful, clear, honest, open, honest, loyal, genuine. Adjective qualifying, women's sincere.
Feminine of sincere. (And no, its origin has nothing to do with the wax).
Sincere: A person that it is transparent in its dealings with others having no double. It is believed that this word is created from which when extracted honey removed the wax is transparent "If wax"