/ˈθul.nɑ/ v.wk.3 to suffer, to endure. (Used with the genitive, i.e. to suffer from.)
Via Middle and Old Valthungian from Griutungi þulan, cf. Gothic þulan, from ProtoGermanic þulāną.
/ˈθy.lins/ n.st.f.i suffering, enduring.
From the verb þulan. (Verbal nouns from non-class-1 weak verbs were assimilated to the weak i-stem ending – including any applicable umlaut – around the time of Middle Valthugian. We would normally expect **þulans here, from a theoretical Middle Valthungian **þulens, from an attested Old Valthungian þulǣns, from Griutungi þulǣns, cf. Gothic þulains, from ProtoGermanic *þulainiz.)
* I broke Linguifex. (I'm sorry!) Once it's working again, I'll update the links above.