1. superlative form of complex; most complicated or difficult to understand or deal with
Usage: superlative degree; formal or technical contexts often prefer 'most complex' over 'complexest'

Examples

• The complexest part of the project was integrating all the different systems.
• Of all the math problems on the test, that equation was the complexest.
• She tackled the complexest issues first to get them out of the way.
• The complexest organisms on Earth have the most specialized cells.
• His explanation made the complexest theory seem almost easy to understand.