Natyashastra
विधुतं वारणे चैव नैवमित्येवमादिषु । निर्भुग्नं चापि विज्ञेयं गम्भीरालोकनादिषु ॥ १५८॥
Vidhuta—in restraining, saying ‘not so’ and the like. Nirbhugna—in looking into depth and the like.
english translation
vidhutaM vAraNe caiva naivamityevamAdiSu । nirbhugnaM cApi vijJeyaM gambhIrAlokanAdiSu ॥ 158॥
hk transliteration by Sanscript