• fortyfild,
• fourtyfold,
• fortifild,
• fortyfolde,
• forthifold,
• fortyfald,
• fourtyforld,
• fortifeld,
• fortyfodl

• forceful,
• forthwith,
• forecast,
• fortnightly,
• foretold,
• frontal,
• fourfold,
• foresight,
• forcible,
• fortnight,
• fortitude,
• fortified,
• fantastic,
• forebode,
• forthright.

The adjective form of the word "fortyfold" is "fortyfold".

The plural form of "fortyfold" remains the same. It does not change in the plural form.

The singular form of the word "fortyfold" is "fortyfold".