bickering (n.) Look up bickering at Dictionary.com
c.1300, "a skirmish," from bicker (v.). Meaning "a verbal wrangle" is from 1570s.
bickering (adj.) Look up bickering at Dictionary.com
1808 in the sense of "contentious," present participle adjective from bicker (v.). Earlier it was used to mean "flashing, quivering" (1660s).