This use of the adjective with a non-copulative verb is a recent development. It should be confined to the billboards and TV ads that popularized it in marketing aphorisms. "Smartly" is grammatical, but it sounds funny there.
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This use of the adjective with a non-copulative verb is a recent development. It should be confined to the billboards and TV ads that popularized it in marketing aphorisms. "Smartly" is grammatical, but it sounds funny there.