In a green manner; with a green appearance, or in an environmentally conscious and sustainable way.
Formed from 'green' plus the adverbial suffix '-ly'. In modern usage, 'greenly' often refers to eco-friendly or sustainable practices, following the 20th-century adoption of 'green' to mean environmentally conscious.
The word 'greenly' is experiencing a renaissance as companies use it to describe sustainable practices, but it's actually an old word that just meant 'in a greenish way'—language adapts to new concerns!
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