Etymology
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worthy (adj.)
mid-13c., "having merit," from worth (n.) + -y (2). Old English had weorþful in this sense. Attested from late 14c. as a noun meaning "person of merit" (especially in Nine Worthies, famous men of history and legend: Joshua, David, Judas Maccabæus, Hector, Alexander, Julius Cæsar, Arthur, Charlemagne, Godfrey of Bouillon -- three Jews, three gentiles, three Christians). Related: Worthily; worthiness.
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trustworthy (adj.)
1791, from trust (n.) + worthy. Related: Trustworthiness.
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quoteworthy (adj.)

"suitable for or deserving of quotation," by 1836; see quote (v.) + worthy (adj.).

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noteworthy (adj.)

"worthy of notice, remarkable," 1550s, from note (v.) + worthy. Related: Noteworthiness.

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newsworthy (adj.)

"of interest to the general public," 1932, from news (n.) + worthy (adj.). Related: Newsworthiness.

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blameworthy (adj.)
also blame-worthy, "deserving blame," late 14c., from blame (n.) + worthy (adj.). Related: Blameworthiness.
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seaworthy (adj.)
1807, "in fit condition to encounter heavy weather at sea," from sea + worthy. Related: Seaworthiness. Old English had særof "hardy at sea."
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praiseworthy (adj.)

mid-15c., preise-worthi, "deserving of praise," from praise (v.) + worthy. Usually hyphenated until mid-19c. An earlier word was preisable (mid-14c.). Related: Praiseworthiness.

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unworthy (adj.)
mid-13c., unwurði, from un- (1) "not" + worthy (adj.). Similar formation in Middle Dutch onwerdich, Dutch onwaardig, Middle Low German unwerdich, Old High German unwirdig, Old Norse uverðugr. Old English had unweorðlic. Related: Unworthiness.
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plausibility (n.)

1590s, "quality of being worthy of praise or acceptance," from plausible + -ity. Especially "a specious or superficial appearance of being right or worthy of acceptance" (by 1640s).

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