Literally: non – instant/agree/conform – non – separate
Alternately: At just the right distance, often mentally rather than physically. Neither approaching nor getting further away. Not loving nor hating; neutral; noncommittal; ambivalent.
Notes: This four-character compound can be read in a more “Japanese” way, by the rules traditionally used to decode Chinese-style writing, as 即かず離れず (tsukazu hanarezu), without significant change in meaning.