A word for “by this means, so” appearing in a list of demonstratives from 1968 (VT49/18), a combination of si “this” and the instrumental suffix -nen. Similarly formed ᴹQ. sínen “✱by this means” appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/111).
Quenya
sinen
in this way; so
sinen
adverb. by this means, so
sinen adv. "in this way; so" (VT49:18)