Vigilant (adjective) خبردار، چونکنا، محتاط

keeping careful watch for possible danger or difficulties.
Example: “the burglar was spotted by vigilant neighbours”
Assertion (noun) حتمی موقف، اقرار واثق، دعویٰ

a confident and forceful statement of fact or belief.
Example: “his assertion that his father had deserted the family”