Characterized by or prone to fluttering; tending to flutter or tremble; somewhat fluttery in nature.
From flutter + -some (suffix meaning characterized by or inclined to, from Old English -sum). This ancient suffix appears in words like handsome, lonesome, and troublesome.
The -some suffix hasn't changed much in a thousand years—Old English speakers used -sum the same way we use -some today, making this word a direct linguistic ancestor from Anglo-Saxon times.
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