[?Optional] an– + a participle/adjective from DUB or LUG? Vs. *tiruvaina, renuvaina/enyaluvaina etc. (PE22 : karuvaina) and Qe. valdëa / vildima. Pity that the page https://www.elfdict.com/w/matter%3B_to_be_of_significance doesn't appear to actually have a word yet.

+ܤܡܝ ܦܠܕܢܝܘܤ‏you mean as in 'to be weighed'?

Or simply "weightful, weighing, pressing", etc. Let's not forget Latin gravis.

+ܤܡܝ ܦܠܕܢܝܘܤ‏ ... I just didn't get the future passive. i see

+ܤܡܝ ܦܠܕܢܝܘܤ It exists, but the semi-colon screws with the URL. I will make sure to fix that bug today. Until then, the word is available here: https://www.elfdict.com/w/vildi-

+Leonard W. unfortunately that's a very early verb and would be difficult to adapt - unless someone has a good idea

Of course we can say we extend the meaning of lunga/lungo. eldamo.org - Eldamo : Quenya : lungo

Another root that could develop a word with this sense is UB eldamo.org - Eldamo : Middle Primitive Elvish : UB²

+Tamas Ferencz that has been a question for me as well. Roots with syllabic L, N or R seem to have i in "present" forms and a in "past" forms but with no rhyme or reason.

+James Coish The development of syllabic L, N, R in Early Quenya depends on whether it was a short or long vowel. Long syllabic L, N, R became al, an, ar, but short syllabic L, N, R had various developments depending on the surrounding consonants.

In Early Primitive Elvish, past tense was often formed by vowel lengthening, which means the Quenya past tense tends to have the vowel “a” and the present tense various other vowels.

See PE12/10-11 or the phonetic discussion in Eldamo starting here:

eldamo.org - Eldamo : Early Quenya : long syllabic [ḹ], [ṝ] became [al], [ar]