1. 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
"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.