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English definition of “simple”

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simple

adjective uk   /ˈsɪm.pl̩/ us  

simple adjective (EASY)

A2 easy to understand or do; not difficult: The instructions were written in simple English. It's simple to find our house. I want an explanation, but keep/make it simple.
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simple adjective (IMPORTANT)

B2 [before noun] used to describe the one important fact, truth, etc.: We didn't go swimming for the simple reason that the water was too cold.
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simple adjective (PLAIN)

B1 without decoration; plain: I like simple food better than fancy dishes.

simple adjective (ONE PART)

B1 [before noun] having or made of only one or a few parts: A hammer is a simple tool. Simple forms of life have only one cell.

simple adjective (NATURAL)

usually approving ordinary; traditional or natural rather than modern and complicated: He was just a simple fisherman.

simple adjective (FOOLISH)

A simple person does not have a normal level of intelligence: He's a bit simple, I'm afraid.
(Definition of simple from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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