* Formal: The professor's lecture was surprisingly intelligible, even for those unfamiliar with the subject matter.
* Informal: I couldn't understand a word she was saying – her accent was completely unintelligible.
* Specific: The instructions were written in simple, intelligible language that anyone could understand.
* Contrastive: While his speech was clear and intelligible, his body language seemed confused and contradictory.
Remember that "intelligible" means "capable of being understood" so the sentence should convey that something is easy to comprehend.