Examples from literature

• I do not think I am a particularly credulous person, or one prone to indulge in easy enthusiasms, and I certainly don't believe in painting a fairy picture in glowing colours by way of being encouraging. 
• She was gentle, simple, credulous, and not at all intriguing, and did not try to draw any benefit from a liaison which at best was only temporary. 
• The credulous soldier and his equally simple sister believed this wonderful tale, and pressed their royal visitor to continue to receive their humble hospitality. 
• This sudden revival of the dead may answer for the credulous lovers of marvels, but it would hardly do for a jury of twelve sober-minded and sworn men. 
• Well, I must have a very benevolent face or a very credulous one!