átgondolniuk
"Átgondolniuk" is a Hungarian verb form. It is the third-person plural conditional of the verb "átgondol". The verb "átgondol" itself means to think over, to reconsider, to reflect upon, or to mull over something.
When conjugated in the conditional mood, "átgondolniuk" specifically refers to the action of "they" (the third-person