From *trudъ (“endevour, work”) + *-ьnъ. *<span class="searchmatch">trudьnъ</span> difficult, laborious In South <span class="searchmatch">Slavic</span>, the word developed an additional meaning pregnant, probably a calque...
Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/tьmьnica Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/tьmьnъ Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/trьvožьnъ Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/<span class="searchmatch">trudьnъ</span>...
labour, effort workload * -ъmь in North <span class="searchmatch">Slavic</span>, -omь in South <span class="searchmatch">Slavic</span>. *truditi (“to toil, to do hard work”) *<span class="searchmatch">trudьnъ</span> (“difficult, laborious”) *trudьnostь...