insensitive time (noun) dead time: unproductive time
Sinonime: average, between, betwixt and between, center, centermost, equidistant, halfway,
inner,
inside, intermediate, intervening,
mainstream, mean, medial, median, medium, mezzo, middle of the road, middlemost, midmost, smack in the middle, straddling the fence
Antonime: border, extreme, outer,
outside