Translation:This book is boring, I don't want to read it anymore.
很 appears in most neutral sentences in which the main verb is a Stative Verb (a.k.a. 'adjective'). Because if this, it is largely washed of its meaning, so to translate it as 'very' overstates the speaker's meaning. In fact, when the speaker leaves out 很 in a typical sentence, it sounds like the first part of a comparison. If the speaker does not continue with a contrasting comparison, the utterance sounds incomplete.