bebna -beb- gismu

x1 is foolish/silly in event/action/property [folly] (ka) x2; x1 is a fool.

See also fenki, xajmi, prije, fliba.

In notes:

fenki
x1 (action/event) is crazy/insane/mad/frantic/in a frenzy (one sense) by standard x2.
fliba
x1 fails at doing x2 (state/event); x1 is a failure at its role in x2.
prije
x1 is wise/sage about matter x2 (abstraction) to observer x3.
xajmi
x1 is funny/comical to x2 in property/aspect x3 (nu/ka); x3 is what is funny about x1 to x2.
bebgau
x1 (event/person) infatuates, causes them to act foolish x2 (person) in manner x3
kambebna
k1 is quality/property exhibited by b1 of being foolish/silly/stupid in event/action /property (ka) b2.
mencre
c1=m2 (person) is intelligent/smart by standard c3.
nunbebna
n1 is an event of b1 being foolish/silly/stupid in event/action /property (ka) b2.
terckasu
c3 (property/event) is ridiculous of c2 (object) to observer c1 with reaction c4.
tolmencre
c1=m2 (person) is unintelligent/dumb/stupid by standard c3.
zanbebna
b1 is naïve about z2
zmimakfa
x1 is automagic to x2, performed by technology x3.
bo'oi (exp!)
attitudinal: silliness - maturity
kerbali
x1 is a kerbal.
postmo
x1 emits random syllables x2 and hopes that x3 interprets them as meaningful, instead of the bullshit they actually are