In an extremely large amount; to a very great degree; vastly.
From 'immense' (from Latin 'immensus' meaning 'unmeasured' or 'boundless,' from 'in-' + 'mensus' meaning 'measured'), plus the adverbial suffix '-ly.' The word entered English around the 1500s and grew popular with Romantic poets who loved describing vast, overwhelming emotions and landscapes.
The word 'immensely' appears 47 times in Jane Austen's novels and was a favorite tool of Romantic-era writers to capture overwhelming feeling — now neuroscience studies show that encountering words about vastness and immensity actually activates the same brain regions involved in experiencing awe, proving that old words and new science validate what writers always knew.
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