What are the unthinkable (acinteyya) dhamma?

I have heard there are 4 unthinkable (acinteyya) concepts in Buddhism. Not Acintya . The four imponderables are identified in the Acintita Sutta, Anguttara Nikaya 4.77, as follows: > > - The Buddha-range of the Buddhas [i.e., the range of powers a Buddha > develops as a result of becoming a Buddha]; > - The jhana-range of one absorbed in jhana [i.e., the range of powers that one may obtain while absorbed in jhana]; > - The [precise working out of the] results of kamma; > - Speculation about [the origin, etc., of] the cosmos is an imponderable that is not to be speculated about. Why It says Unthinkable?