Shameful

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Old English sc(e)amful ‘modest, shamefaced’ (see shame, -ful).

wiktionary

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From Middle English schameful, schamfull, from Old English *sċeamfull, sċeomfull, equivalent to shame +‎ -ful. Cognate with Danish skamfuld(“shameful, shamefast, ashamed”).

etymonline

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shameful (adj.)

Old English scamful "modest;" see shame (n.) + -ful. Meaning "disgraceful, causing shame" is from c. 1300. Related: Shamefully; shamefulness. Middle English shamely (adv.) "shamefully" for some reason has fallen from use. Old English scamlic (adj.) "shameful, disgraceful," but this also could mean "modest."