Also means
single (one only)
Usage Note
Simple is invariable in gender (un diseño simple, una respuesta simple). It can mean 'uncomplicated' (positive) or 'simplistic/dull' (mildly negative) depending on context. In grammar, tiempo simple contrasts with tiempo compuesto (compound tense). The adverb is simplemente; the noun simplicidad.
Examples
"La solución más simple suele ser la mejor."
Natural Translation
The simplest solution is usually the best.

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