Having a surface without bumps, rough spots, or irregularities; or more pleasant and easier than something else.
From Old English 'smōð,' related to Germanic roots meaning 'soft' or 'slippery.' The comparative form 'smoother' adds the standard '-er' suffix used in English to compare two things.
The word 'smooth' actually has a hidden connection to 'smear'—both come from Indo-European roots about making things slippery or spreading them out, which is why smooth surfaces are often described as 'slick' in casual speech.
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