1. the quality or state of being complicated; complexity.
Usage: formal or literary; less common than 'complexity'
2. a complicated or intricate element or feature; a complication.
Usage: formal or literary

Examples

• The complicacy of the legal system makes it difficult for ordinary citizens to navigate.
• She appreciated the complicacy of the novel's plot structure.
• The complicacy of modern technology requires specialized training.
• Despite the complicacy of the situation, they found a practical solution.
• The complicacy involved in international trade negotiations cannot be underestimated.