* The baby slept soundly. (The verb "slept" doesn't take a direct object.)
* The leaves fell from the tree. (The verb "fell" doesn't take a direct object.)
* The dog barked loudly. (The verb "barked" doesn't take a direct object.)
* She laughed at the joke. (While "joke" appears after the verb, it's a prepositional phrase, not a direct object.)
* The sun rises in the east. (The verb "rises" doesn't take a direct object.)
Intransitive verbs are verbs that don't take a direct object. They express an action or state of being that doesn't involve a receiver of the action.