"complexest" in the adjective sense
1. complex
complicated in structure consisting of interconnected parts
"a complex set of variations based on a simple folk melody"
"a complex mass of diverse laws and customs"
2. complicated, complex
difficult to analyze or understand
"a complicated problem"
"complicated Middle East politics"
"he's more complex than he seems on the surface"
Source: WordNet® (An amazing lexical database of English)
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