sternest
Sternest refers to the superlative form of the adjective "stern." When something is described as the sternest, it signifies the highest degree of severity, strictness, or firmness. This can apply to a person's demeanor, a set of rules, or even a difficult situation. For instance, a stern parent might be the one who enforces the most rigorous discipline, or the sternest criticism would be the most biting and unforgiving.
The word stern itself implies an unyielding and often serious attitude, conveying disapproval or a strong sense