Without cracks, fissures, or breaks; smooth and undamaged; also used to mean quiet or without cracking sounds.
From 'crack' plus the suffix '-less' meaning 'without.' This simple but effective negation creates an adjective describing the absence of either physical breaks or crackling sounds.
In the 1700s-1800s, ceramics makers heavily advertised 'crackless' pottery and china as a major selling point—having a plate that wouldn't develop the craze-pattern cracks was genuinely luxurious and represented superior manufacturing!
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