"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

A quoter from Boswell's Life of Johnson:
[7] "April 23, 1753. I know not whether I do not too much indulge the vain longings of affection; but I hope they intenerate my heart, and that when I die like my Tetty, this affection will be acknowledged in a happy interview, and that in the mean time I am incited by it to piety. I will, however, not deviate too much from common and received methods of devotion."