1. dark, dim, or misty; obscured by fog or haze
Usage: literary or formal
2. unclear or confused in meaning; hard to understand
Usage: formal

Examples

• The caliginous fog rolled in from the harbor, obscuring the lighthouse.
• His caliginous prose made the article difficult for readers to follow.
• On that caliginous morning, visibility was reduced to just a few feet.
• The caliginous nature of the legal document left many questions unanswered.
• Through the caliginous mist, we could barely see the path ahead.
• Her caliginous explanation only deepened the confusion among the students.