simple

simple /ˈsɪmpəl/ adjective
simpler; simplest
simple
/ˈsɪmpəl/
adjective
simpler; simplest
Britannica Dictionary definition of SIMPLE
[or more simple; most simple]
1 
: not hard to understand or do
2 
: having few parts : not complex or fancy
3 
always used before a noun : not special or unusual : ordinary
4 
always used before a noun : complete and total — used for emphasis
5 
grammar, of a sentence : having only one main clause and no additional clauses
6 
old-fashioned : not very intelligent

pure and simple

— see pure

the simple life

◊ If you live the simple life, you do not own many things or use many modern machines and you usually live in the countryside.