Usage patterns
〈綿密な〉計画a meticulously detailed plan
They drew up a meticulously detailed plan to carry out the crime.
綿密に〈動詞〉to do something (investigate, check, examine) in careful detail
The police investigated the crime scene in meticulous detail.
綿密な〈事〉a thorough, carefully worked-out (analysis, preparation, etc.)
Behind the success lay thorough, careful preparation.