Relentless (adjective) سخت، شدید، کڑا، سنگدل، بے رحم

unceasingly intense.
Example: “the relentless heat of the desert”
Synonyms: persistent, continuing, constant, continual, continuous, non-stop, lasting, never-ending
Antonyms: short-lived, irresolute, intermittent
Indignation (noun) شدید غصہ، خفتگی

anger or annoyance provoked by what is perceived as unfair treatment.
Example: “the letter filled Lucy with indignation”
Synonyms: resentment, umbrage, affront, disgruntlement, anger, distress, unhappiness, discontent
Antonyms: contentment