nandu -nad- gismu

x1 is difficult/hard/challenging for x2 under conditions x3; x1 challenges (non-agentive) x2.

See also frili, nabmi, jdari, talsa, tinsa.

In definition:

mudrperikopsi
m1 is a quantity of/is made of/contains African teak/afromosia/Nandu wood of type m2.

In notes:

frili
x1 (action) is easy/simple/facile for x2 (agent) under conditions x3; x2 does x1 freely/easily.
jdari
x1 is firm/hard/resistant/unyielding to force x2 under conditions x3.
nabmi
x1 (event/state) is a problem to/encountered by x2 in situation/task/inquiry x3.
talsa
x1 (person) challenges x2 at/in property x3.
tinsa
x1 is stiff/rigid/inflexible/resistant in direction x2 against force x3 under conditions x4.
cuxnadytcini
x1=t1 is a dilemma between x2=t2=c3
toltinsa
x1 is flexible/supple/limber/bendable/non-resistant in direction x2 against force x3 under conditions x4.
vaxselnandu
n2=v1 has difficulty breathing gas v2 under conditions n3; n1=v1 pants.