bickering (n.) Look up bickering at Dictionary.com
c. 1300, "a skirmish," verbal noun 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).