a. 1. Not essential; not of prime importance; not indispensable; unimportant. Addison. [ 1913 Webster ]
2. Void of essence, or real being. [ R. ] Milton. [ 1913 Webster ]
n. Something not constituting essence, or something which is not of absolute necessity; as, forms are among the unessentials of religion. [ 1913 Webster ]
adv. In an unessential manner. [ 1913 Webster ]