• sūnṛtā — pleasing and true words
  Vedic compound — words that are both sweet and truthful (a Ṛgveda virtue). Akrūra's speech is sūnṛtā in the technical sense, hence the more painful that Dhṛtarāṣṭra cannot retain it.
• hṛdi na sthīyate — do not remain steady in my heart
  Locative + passive — 'in the heart there is no standing.' The Bhāgavata's most poignant Sanskrit for the bhakta-failure mode: hearing without keeping. Pre-figures the diagnostic conversations Vidura will have with him.
• putra-anurāga-viṣame — prejudiced by affection for sons
  Triple compound: putra + anurāga (deep attachment) + viṣama (uneven). The exact opposite of sama (18, 19, 25). His own diagnosis exactly matches Akrūra's.
• vidyut saudāmanī — lightning in a cloud
  Vidyut (lightning) + saudāmanī (born of clouds). A doubled image — the same flash, named twice. The verse insists the brilliance is real and the impermanence is also real; both must be held together.

• Bhanu Sw SB 10-49-27-31 - Ultimately one%27s choice decides the outcome not the influences of Karma - ISKCON Chennai
  His Holiness Bhanu Swami· English

Auspicious words land on his heart the way lightning lands on a passing cloud — bright for a moment, gone the next, the cloud already moving with its own wind. Dhṛtarāṣṭra confesses the simile against himself. He sees and still cannot hold.