le ‧ gal ‧ ist ‧ ic /ˌliːɡəˈlɪstɪk◂/ BrE AmE adjective
[ Word Family: noun : ↑ legality ≠ ↑ illegality , ↑ legalization , ↑ legalese , ↑ illegal ; adjective : ↑ legal ≠ ↑ illegal , ↑ legalistic ; verb : ↑ legalize ; adverb : ↑ legally ≠ ↑ illegally ]
too concerned about small legal details:
a legalistic interpretation of the agreement