What does the author mean by "base passions" in this sentence? Following sentence is from book "Brain Rules for Baby by John Medina"
Philosophy titans such as David Hume thought that base passions powered moral decisions.
Collins dictionary directed me to a page with a number of definitions of base, noun, which might be relevant here:
2A conceptual structure or entity on which something draws or depends
2.1A foundation or starting point for further work
4A main or important element or ingredient to which other things are added
Way down at the bottom, after entries for the verb, for phrases, for rhymes, for the etymology, and after an advertisement, I eventually discovered definitions for base, adjective:
1 Without moral principles; ignoble
2 archaic Denoting or befitting a person of low social class
I cannot tell which of these meanings is intended.