Having qualities resembling or characteristic of a crone, such as being old, wrinkled, or speaking in a raspy voice.
From 'crone' (an old woman) plus the suffix '-ish', which means 'somewhat like' or 'having the character of'; this construction became common in English to describe resemblance to a quality.
The suffix '-ish' is brilliantly lazy—instead of saying 'somewhat old and wrinkled like a crone,' English speakers created 'cronish' as a shorthand, and languages do this all the time to save breath and energy.
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