Old Norse þrjóta

← Proto-Germanic *þreutaną (inherited)

← Proto-Indo-European *trewd- (root)

← Proto-Indo-European *trewd- (derived)

→ Old English þreotan (cognate)

→ Old English aþreotan (cognate)

→ Danish fortryde (inherited)

→ Westrobothnian truut (inherited)

→ Old Swedish þryta (inherited)

→ Icelandic þrjóta (derived)

→ Norwegian Nynorsk tryta (derived)

→ Swedish trött (inherited)

→ Swedish tryta (inherited)