Having qualities or characteristics suggestive of a gnome; whimsical, fantastical, or mysteriously wise in manner.
From 'gnome' plus the suffix '-esque' (from French/Italian, meaning 'in the manner or style of'). This suffix is commonly used in English to create adjectives describing styles or qualities, as in 'picturesque' or 'grotesque.'
'Gnomesque' is what happens when English borrows a French suffix to describe something fundamentally whimsical—it's like fantasy fiction realized in word formation, making the word itself a bit magical.
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