Simple
/ˈsɪmpəl/
noun
A herbal preparation made from one plant, as opposed to something made from more than one plant.
(by extension) A physician.
A simple or atomic proposition.
verb
To gather simples, i.e. medicinal herbs.
adjective
Uncomplicated; taken by itself, with nothing added.
Without ornamentation; plain.
Free from duplicity; guileless, innocent, straightforward.