| dubiously | (adverb) in a doubtful manner | Synonyms: doubtfully |
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| (adverb) in a questionable and dubious manner | Synonyms: questionably |
| due | (adverb) directly or exactly; straight | - |
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| dully | (adverb) without liveliness | - |
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| (adverb) without luster or shine | - |
| duly | (adverb) in accordance with what is appropriate or suitable for the circumstances | Synonyms: appropriately, befittingly, fitly, fittingly, properly, suitably |
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| dumbly | (adverb) mutely | - |
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| (adverb) stupidly or insensitively | Synonyms: densely, obtusely |
| dutifully | (adverb) out of a sense of duty; in a dutiful manner | - |
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