There is no plural for difficult.
The plural of "Difficult" is "Difficulties."
Difficile is a French equivalent of 'difficult'. It's pronounced 'dee-fee-seel'. There's just one form each, in the singular and the plural, for 'difficult' critters, objects and peoples.
Hardships is a noun, the plural form of hardship.
Fathers and sons often have difficult relationships.
The plural of 'this' is 'these' and the plural of 'that' is 'those'.
The plural of "Difficult" is "Difficulties."
The plural of "it's a difficult exam" would be "they're difficult exams."
Singular possessive: go-between'sex. "My go-between's job is difficult."Plural: go-betweensex. "How many go-betweens does Mary have running around for her?"Plural possessive: go-betweens'ex. "Mary's many go-betweens' jobs are quite difficult."
Difficile is a French equivalent of 'difficult'. It's pronounced 'dee-fee-seel'. There's just one form each, in the singular and the plural, for 'difficult' critters, objects and peoples.
The plural form for the noun leader is leaders. The plural possessive form is leaders'.
This is a very archaic (out of fashion) word, so the meaning of this word is very difficult to find.
Molto difficile in the singular and molto difficili in the plural are Italian equivalents of the English phrase "very difficult." Context makes clear whether a reference to one (case 1) or more (example 2) of someone or something difficult suits. The respective pronunciations will be "MOL-to deef-FEE-tchee-ley" in the singular and "MOL-to deef-FEE-tchee-lee" in the plural in Italian.
Please drop the avocados and back away slowly. Those avocados are not quite ripe.
Fathers and sons often have difficult relationships.
Hardships is a noun, the plural form of hardship.
The plural of "she" is "they", so the plural of "she had" is "they had".
The plural of 'this' is 'these' and the plural of 'that' is 'those'.