In a deprecative manner; with disapproval, regret, or apologetic intent.
From deprecative (adjective) + -ly (adverbial suffix). The double suffix structure (-ive + -ly) is standard for forming adverbs from -ive adjectives.
When you add -ly to -ive adjectives, you get formal adverbs often used in literature—'deprecatively,' 'creatively,' 'defensively'—they sound more dignified than simpler adverbs.
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