Explaining EvilJ. Harold Ellens describes the Giants of Genesis 6.1-4 as “rambunctious”.

In Genesis 6, … evil in the world is explained by angels cohabiting with women and producing a generation of rather rambunctious giants

– J. Harold Ellens, Introduction to Explaining Evil: Vol. 1: Definitions and Development (ABC-CLIO, 2011): p. 5.

Explaining Evil is a 3-volume set: (Vol. 1) Definitions and Development; (Vol. 2) History, Global Views, and Events; and (Vol. 3) Approaches, Responses, Solutions.