In a smart, thoughtful way that shows understanding and good thinking skills.
From Latin 'intelligens' (understanding, discerning), from 'intellegere' (to understand), combined with the adverb suffix '-ly'. The root 'inter-' (between) and 'legere' (to choose/read) originally meant 'to read between the lines.'
The word 'intelligent' literally means 'to read between'—so intelligent people are those who can find meaning beyond the surface. This is why we still say someone 'reads between the lines' when they understand hidden meanings.
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