Without clouds; clear and unobstructed, especially of the sky; free from dimming or obscuring elements.
From 'cloud' plus the privative suffix '-less' (from Old English, meaning 'without'), which negates or removes the quality of the root word.
A truly cloudless sky is rare near cities because air pollution creates 'condensation nuclei'—tiny particles that give water vapor something to cling to and form clouds with, so pollution paradoxically creates more clouds!
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