originative (adj.)

• causal
• causative
• conceptive
• conceptual
• constitutive
• constructive
• creative
• decisive
• determinative
• effectual
• etiological
• fecund
• fertile
• formative
• generative
• germinal
• ideational
• imaginative
• ingenious
• innovational
• innovative
• inspired
• inventive
• notional
• occasional
• original
• pivotal
• pregnant
• productive
• prolific
• seminal
• shaping
• teeming
• visioned