No
critical or opinionated
While "essential" and "critical" are often used interchangeably, they have slightly different connotations. "Essential" refers to something that is absolutely necessary or fundamental to a particular purpose or function. In contrast, "critical" implies a sense of urgency or importance, often in a situation that requires immediate attention. Therefore, while they can overlap in meaning, they are not strict synonyms.
Important, critical
Serious, critical.
*Malignant* - severe , critical and chronic.
life-sustaining, essential
* necessary * vital * important
essential, need, imperative
Essential, vital, necessary.
logical, investigative, diagnostic, systematic, critical
needed, necessary, required
No, they are the opposite words.