The story
- Latin · derived fromminax“threatening”
- Late Latin · derived fromminacia“threat”
- English todayminaciousness
From minacious + -ness, from Late Latin minacia (“threat”), from Latin minax (“threatening”).
Words from the same roots
Late Latinminacia all →
menaceminaciousminaciously
Latinminax all →
menaceminaceousminaciousminaciouslyminacity
Etymology from Wiktionary, CC BY-SA 4.0.