adjective
Uncomplicated; lacking complexity; taken by itself, with nothing added.
Easy; not difficult.
Without ornamentation; plain.
Free from duplicity; guileless, innocent, straightforward.
Undistinguished in social condition; of no special rank.
(archaic) Trivial; insignificant.
(now colloquial, euphemistic) Feeble-minded; foolish.
(heading, technical) Structurally uncomplicated.
(obsolete) Mere; not other than; being only.
noun
(pharmacology) A herbal preparation made from one plant, as opposed to something made from more than one plant.
(obsolete, by extension) A physician.
(logic) A simple or atomic proposition.
(obsolete) Something not mixed or compounded.
(weaving) A drawloom.
(weaving) Part of the apparatus for raising the heddles of a drawloom.
(Roman Catholicism) A feast which is not a double or a semidouble.
verb
(transitive, intransitive, archaic) To gather simples, i.e. medicinal herbs.