simple

adjective simpler, simplest

1. having or consisting of only one part, feature, substance, etc.; not compounded or complex; single
2. having few parts or features; not complicated or involved: a simple pattern
3. easy to do, solve, or understand, as a task, question, etc.
4. without additions or qualifications; mere; bare: the simple facts
5. 1. not ornate; unembellished; unadorned: simple clothes
   2. not luxurious or elegant; plain: simple tastes
6. pure; unadulterated
7. without guile or deceit; innocent; artless
8. 1. without ostentation or affectation; natural
   2. lacking sophistication; naive
9. of low rank or position; specif.,
   1. humble; lowly
   2. common; ordinary
10. lacking significance; unimportant
11. 1. having or showing little sense or reasoning ability; easily misled or deceived; stupid or foolish
    2. uneducated or ignorant
12. Bot.
    1. consisting of one piece; whole
    2. not branched
    3. developing from a single pistil or carpel: a simple fruit
13. Chem.
    1. elementary
    2. unmixed
14. Law unconditional; absolute: in fee simple
15. Zool. not divided into or made up of parts; not compounded: a simple eye

noun

1. a person who is ignorant or easily misled
2. something having only one part, substance, etc.
3. Archaic
   1. a medicinal herb
   2. a medicine made from such a plant
4. Archaic a person of humble position