lymphatic1. Sluggish; lacking energy. 2. Of or relating to lymph.From Latin lympha (lymph, water). Formerly it was believed that an excess of lymph in the system resulted in sluggishness. Earliest documented use: 1649.USAGE:"The day has been a real lazy one and I have felt lymphatic accordingly."Thomas Worthington King; Journal of a Voyage Around the World; The Ohio State University Press; 2003.