tolmlerai lujvo

m1=t1 is the ugliest/[most unsightly] among set/range t3 to m2 in aspect m3 (ka) by aesthetic standard m4.

Cf. to'e, melbi, zmadu, tolmle, tolmlemau, mectolmlerai, tolmleme'a.

In notes:

mectolmlerai
me1=t1 is least ugly among set/range t3 to me2 in aspect me3 (ka) by aesthetic standard me4.
tolmle
x1 is ugly to x2 in aspect x3 (ka) by aesthetic standard x4.
tolmlemau
z1=m1 is uglier/[more unsightly] than z2 to m2 in aspect m3 (ka) by amount z4.
tolmleme'a
ml1=me1 is less ugly/unsightly than ml2 to me2 in aspect me3 (ka) by amount ml4.