hardest
adj.adj. the most difficult or solid thing compared to all others. You use this to describe the task that takes the most effort or the material that is the most firm.
adj. the superlative form of hard, indicating the maximum degree of difficulty, physical solidity, or intensity within a group. Functions as a superlative adjective requiring a definite article or possessive pronoun.
This is the hardest exam I have ever taken.
The hardest part of moving to a new city is often finding a community where you feel at home.
Diamond is famously the hardest natural substance on Earth, a property that makes it indispensable for industrial cutting and drilling applications.
Typically preceded by the definite article 'the' or a possessive adjective like 'my' or 'his'.
the most hardestthe hardestLearners often double the superlative by adding 'most' to a word that already has the '-est' suffix.