This is the 869th most frequent Icelandic word.
áhugasamir
"Interested" or "enthusiastic."
Here, 'áhugasamir' describes students who are interested, used as a plural adjective matching 'nemendur' (students).
Áhugasamir nemendur safnast saman í bókasalnum.
Interested students gather in the library.
In this sentence, 'áhugasama' is the accusative plural form, agreeing with 'ferðamenn' (tourists) in case and number.
Við töluðum við áhugasama ferðamenn í miðborginni.
We spoke to interested tourists in the city center.
Here, 'áhugasama' refers to people who are interested as a substantive, in plural accusative form.