The noun simple has 2 senses (no senses from tagged texts)
1. simple -- (any herbaceous plant having medicinal properties)
2. simpleton, simple -- (a person lacking intelligence or common sense)
Overview of adj simple
The adj simple has 7 senses (first 5 from tagged texts)
1. (65) simple -- (having few parts; not complex or complicated or involved; "a simple problem"; "simple mechanisms"; "a simple design"; "a simple substance")
2. (10) elementary, simple, uncomplicated, unproblematic -- (easy and not involved or complicated; "an elementary problem in statistics"; "elementary, my dear Watson"; "a simple game"; "found an uncomplicated solution to the problem")
3. (4) bare, mere, simple -- (apart from anything else; without additions or modifications; "only the bare facts"; "shocked by the mere idea"; "the simple passage of time was enough"; "the simple truth")