This is the 991st most frequent Estonian word.
kadunud
"Kadunud" means "lost" in English.
In this sentence, 'kadunud' describes the state of the boy being missing.
Kadunud poiss leiti metsa alt.
The missing boy was found under the tree in the forest.
Here, 'kadunud' is used as an adjective describing the state of the keys being lost.
Mu võtmed on kadunud.
My keys are lost.
Here, 'kadunud' metaphorically describes the state of the soul being lost in a figurative sense.