ruble -rub-ble- gismu

x1 is weak/feeble/frail in property/quality/aspect x2 (ka) by standard x3.

See also carmi, vlipa, tsali, kandi, kandi, milxe.

On gloss:

ru'unru'ubu in sense "Russia, Rubles currency"
x1 is measured in currency with code ISO-4217 “RUB” (Russian Rouble, Russian Ruble) as x2 (number).

In definition:

rupnu
x1 is measured in major-money-units (dollar/yuan/ruble) as x2 (quantity), monetary system x3.

In notes:

carmi
x1 is intense/bright/saturated/brilliant in property (ka) x2 as received/measured by observer x3.
kandi
x1 is dim/dull/pale/non-intense in property x2 (ka) as received/measured by observer x3.
milxe
x1 is mild/non-extreme/gentle/middling/somewhat in property x2 (ka); x1 is not very x2.
tsali
x1 is strong/powerful/[tough] in property/quality x2 (ka) by standard x3.
vlipa
x1 has the power to bring about x2 under conditions x3; x1 is powerful in aspect x2 under x3.
cmacai
ca1=cm1 is tiny/miniature/diminutive/very small in property ca2=cm2 to observer ca3=cm3.
cmacma
c1 is tiny/miniature/diminutive/very small in property c2 with criterion c3.
lauble
r1=c1 sounds quiet/weak at observation point c2 by standard c3=t3.