1easily understood or done; presenting no difficulty:a simple solution camcorders are now so simple to operate [attributive] used to emphasize the fundamental and straightforward nature of something:the simple truth 2plain, basic, or uncomplicated in form, nature, or design; without much decoration or ornamentation:a simple white blouse the house is furnished in a simple country style humble and unpretentious:a quiet unassuming man with simple tastes 3composed of a single element; not compound. Mathematics denoting a group that has no proper normal subgroup. Botany (of a leaf or stem) not divided or branched. (of a lens, microscope, etc.) consisting of a single lens or component. (in English grammar) denoting a tense formed without an auxiliary, for example sang as opposed to was singing. (of interest) payable on the sum loaned only. Compare with compound1.
4of very low intelligence.
a medicinal herb, or a medicine made from one:the gatherers of simples