trucis
trucis is a Latin form of trux, meaning “fierce, savage, harsh”. It is the genitive singular adjective.
Found 30 times in the Latin texts on Socratos.
Where it is used
Vergil, Georgics 1.370: At Boreae de parte trucis cum fulminat et cum
All forms of trux (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.