On Académie Française the sentence « Je me suis ennuyé à lire ce livre. » is written. I would like to know the meaning of this sentence and more importantly I’ve been trying to find out if the construction « s’ennuyer à infinitive » exists and the meaning of that construction. I’ve checked Le Robert, Larousse, Word Reference, Collins Dictionary and CNRTL but I couldn’t find anything.
Thus please could you guys tell me
(1) the meaning of « Je me suis ennuyé à lire ce livre. »
(2) if the construction « s’ennuyer à faire qch » exists and its’ meaning and please could you provide your source
Thank you!