inarguable (adjective)

1. The fact that Julius Caesar was assassinated on the Ides of March is inarguable.

2. The impact of William Shakespeare's works on the English language is inarguable.

3. The terrifying presence of the supernatural in the haunted house was inarguable.

4. The existence of extraterrestrial life in the science fiction novel is inarguable according to the storyline.