tŕdno prislov firmly, fast; firm
tŕdno se držati česa to keep a firm hold of something
tŕdno sem prepričan (odločen) I am firmly (ali fully) convinced (resolved)
tŕdno priviti (vijak) to tighten (a screw)
tŕdno spati to be fast asleep, to sleep like a log
tŕdno verovati v kaj to be a firm believer in something