Tending to complicate or make something more difficult; having the quality of adding complexity.
From complicate plus the adjective-forming suffix -ive. The suffix -ive (from Latin -ivus) means 'tending to' or 'characterized by,' turning the verb into an adjective describing what complication tends to do.
This word is technically correct but almost never used—we say 'complicating' instead. It's a linguistic relic showing how English prefers present participles as adjectives over formal -ive formations, making language more dynamic and less Latin-like.
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