Although the identify itself may possibly translate into "awful" and "fearful", the actual interpretation is quite distinctive. It means he is the Lord who shields his devotees from external enemies; as also from interior enemies including greed, lust, anger and all other negative feelings. व्यालयज्ञसूत्रमिन्दुशेखरं कृपाकरम् । Who's Kalabhairava? https://www.youtube.com/watch?v=S2iLMNuDYc0