curve -cuv- gismu

x1 is pure/unadulterated/unmitigated/simple in property x2 (ka).

x1 is simply/purely/unmitigatedly/solely x2. See also prane, jinsa, manfo, sampu, sepli, traji, lumci, xukmi.

On gloss:

kruvi
x1 is a curve/turn/bend in x2, at locus x3, and defined by set of points/properties x4.

In definition:

bargu
x1 arches/curves over/around x2 and is made of x3; x1 is an arch over/around x2 of material x3.
jbislanu
x1 is an object that has a shape that is three-dimensional and has an axis (especially of symmetry and/or along which cross-sections are mutually similar), or which is approximately a figure of revolution, or which is approximately the result of taking a two-dimensional shape and sweeping it along a curve in a constant way; x1 is (nearly) cylindrical and is made of/has composition x2, having geometric/topological properties x3.
selbargu
x2=b1 arches/curves over/around x1=b2 and is made of x3=b3; x2=b1 is an arch over/around x1=b2 of material x3=b3.
terbargu
x3=b1 arches/curves over/around x2=b2 and is made of x1=b3; x3=b1 is an arch over/around x2=b2 of material x1=b3.
xadykru
x1 is a curve in x2's body, at locus x3, defined by points x4
ze'okru
x1 is a convex curve/turn/bend in x2, at locus x3, and defined by set of points/properties x4.
zorkru
x1 is a concave curve/turn/bend in x2, at locus x3, and defined by set of points/properties x4.
clenu
x1 is an axis/center curve/extended center (or, possibly metaphorically, focus 'point') of x2 in sense x3
sirjrneuei
x1 (line segment) is a neuein/neusis line segment (line element) constructed from directrix x2 (curve; not necessarily linear) to catchline x3 (curve; not necessarily linear, despite the name) which is inclined toward pole x4 (point) such that it has diastema (length) x5 (li; nonnegative extended-real number).
tsekane
x1 (linear manifold, vector, etc.) is/lies secant to x2 (object, surface, curve, manifold, etc.) passing through or toward points/loci x3 (set of intersected points), by standard/definition/in system x4.
zo'anjo
x1 (linear manifold, vector, etc.) is/lies tangent to x2 (object, surface, curve, manifold, etc.) at point/locus x3, by standard/definition/in system x4.

In notes:

cidni
x1 is a/the knee/elbow/knuckle [hinged joint, body-part] of limb x2 of body x3.
clupa
x1 is a loop/circuit of x2 [material].
jinsa
x1 (object) is clean/pure of material/contaminant/dirt x2 by standard x3.
lumci
x1 (agent) washes/cleanses x2 of soil/contaminant x3 in/with cleaning material(s) x4.
manfo
x1 (object/event) is uniform/homogeneous in property x2 (ka).
prane
x1 is perfect/ideal/archetypical/faultless/flawless/un-improvable in property/aspect x2 (ka).
sampu
x1 is simple/unmixed/uncomplicated in property x2 (ka).
sepli
x1 is apart/separate from x2, separated by partition/wall/gap/interval/separating medium x3.
traji
x1 is superlative in property x2 (ka), the x3 extreme (ka; default ka zmadu) among set/range x4.
xukmi
x1 is an instance of substance/chemical/drug x2 (individual or mass) with purity x3.
kurvinkru
x1 is the orthoptic of x2
pinxydja
x1 is drinking water
pixydja
c1 is drinking water for c2.
pixyjau
x1 is drinking water
kukru
x1 is orthogonal/perpendicular/right/at right angle/rectified/square/normal to x2, where they (are projected to) intersect orthogonally at locus/on set x3, otherwise being utterly distinct (and not even on the same axis/scale) in sense x4
bolstropfedo
x1 is arranged and to be traced/read in boustrophedon manner, starting at point x2, turning at points x3 (ordered list), and ending at point x4.
si'impetotki
x1 (value, state, form) is the asymptote/limit [Calculus sense] of function/dependent variable/limitand x2 as independent variable(s) x3 tend(s) toward point/respective value(s)/tuple x4 along path/from direction x5.
cuvmuj
Pure Land in the traditions of Buddhism, Daoism, Bon, and other faiths.