Similar word to timeconsuming:

backward, behindhand, belated, conservative, dead, delayed, detained, dilatory, down, draggy, dull, gradual, hindered, impeded, inactive, lingering, long-delayed, long-drawn-out, low, moderate, off, overdue, prolonged, protracted, reduced, slack, sleepy, sluggish, stagnant, stiff, tame, tardy, tedious, time-consuming, uneventful, unproductive, unprogressive, unpunctual