In a cheery or bright manner; with cheerfulness and optimism.
From 'cheery' (full of cheer) plus the adverb-forming suffix '-ly.' The '-ly' suffix transforms adjectives into adverbs that describe how actions are performed.
Adverbs ending in '-ly' are so common we barely notice them, but they're actually a genius invention—they let us build unlimited descriptors without memorizing new words, since almost any adjective can become an adverb this way.
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