興味 きょうみ津々 しんしん
kyōmishinshin

no-Adjective
To-Adverb

1. very interesting; of absorbing interest; having a keen interest (in); being immensely curious (about)

Yojijukugo
この ほん興味 きょうみ津々 しんしんたるものがあって きない。
kono honwa kyōmishinshintaru monoga atte akinai.
This book is so absorbing that I can't put it down.
Other forms: