Pronunciation: (sim-plis'i-tē),[key] —n., —pl.-ties. 1. the state, quality, or an instance of being simple.
2. freedom from complexity, intricacy, or division into parts: an organism of great simplicity. 3. absence of luxury, pretentiousness, ornament, etc.; plainness: a life of simplicity. 4. freedom from deceit or guile; sincerity; artlessness; naturalness: a simplicity of manner. 5. lack of mental acuteness or shrewdness: Politics is not a field for simplicity about human nature.