Mahabharata 1.167.18

अदृश्यन्ती तु तं दृष्ट्वा क्रूरकर्माणमग्रतःभयसंविग्नया वाचा वसिष्ठमिदमब्रवीत्

adṛśyantī tu taṃ dṛṣṭvā krūrakarmāṇamagrataḥbhayasaṃvignayā vācā vasiṣṭhamidamabravīt

Our plain-language meaning of this verse is waiting for scholar review.