hairsplitting
1. [ adjective ] developed in excessively fine detail
Synonyms: finespun
Examples:

"finespun distinctions"

Related terms: precise
2. [ noun ] (psychology) making too fine distinctions of little importance
Synonyms: word-splitting
Examples:

"they didn't take his hairsplitting seriously"

Related terms: differentiation
Similar spelling:   hairsplitter
  hairspring