"Intenerate" seems so potentially useful I'm surprised it
became so rarely used.It reminds me but may not be cognate
with "tenesmus" a medicalword for a cruel affliction:
tenesmus
n.
5ML < L tenesmos < Gr teinesmos < teinein, to stretch: see THIN6 Med. a feeling of urgent need to defecate or urinate, with a straining but unsuccessful effort to do so