Quenya 

lumna-

be heavy

lumna- stativevb. "be heavy" (LR:47, SD:310; cf. lumna_- "to lie heavy" in the Etymologies, stemDUB-)_. A form lúvë was mentioned in connection with this verb, possibly a strong past tense form directly derived from the root DUB- (primitive *dūbē), but Tolkien struck it out (VT45:11).