31 synonyms for time consuming such as detailed, cumbersome, and demanding. Time consuming is an adjective, and its antonyms are quick and efficient.
Cumbersome, Demanding, Detailed, Diligent, Discouraging, Drawn-out, Exhausting, Extensive, Hard work, Intensive, Involved, Laborious, Lengthy, Methodical, Onerous, Overwhelming, Persistent, Ponderous, Prolonged, Repetitive, Slow, Slow-moving, Slow-paced, Strenuous, Tedious, Time-draining, Time-intensive, Tiresome, Unending, and Unproductive.