noun which may take the genitive case particle 'no', taru-adjective, adverb taking the 'to' particle
very interesting; absorbing; keenly interested; immensely curious
yojijukugo (four-character idiom)
Describes a state of intense curiosity or fascination, either about something (~に興味津々) or as a description of a person's attitude. Often used with ~に or as a の-adjective modifying a noun.