simple

adjective (simpler, simplest)

• 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.

noun

• a medicinal herb, or a medicine made from one:the gatherers of simples