sin (1) a word either meaning "thus" (adverb) or "this" (as an independent word in the sentence, not modifying another word like sina does). Attested in the sentence sin quentë Quendingoldo Elendilenna, either *"this Pengolodh said to Elendil" or "thus spoke Pengolodh to Elendil" (PM:401). Patrick Wynne argues that sin is an adverb “thus” derived from the stem si- “this (by me)” (VT49:18)
sin (2) adv., a form of sí "now" (q.v.) often occurring before vowels; also sín(SI). However, sí itself (q.v.) may also appear before a vowel.
sina demonstrative "this" (following its noun in our sole example: vanda sina "this oath"). (CO, VT49:18; in the latter source, sina is called an adjective). This word would, like Sindarin hen, be derived from primitive ¤sĭnā (VT49:34). Cf. sin #1.
sínapassive participle “known, certain, ascertained” (PE17:68), connecting with ista- and sintë. Also sinwa.
