English Translation
I never thought about that.
may be more natural: Ik heb daar nooit over nagedacht.
• denken = to think (in general)
• Ik denk dat hij komt. = I think he’s coming.
• nadenken (over) = to think something through / consider / reflect on
• Ik moet over dat probleem nadenken. = I need to think about that problem.
When you want “I’ve never thought about that,” Dutch almost always picks nadenken.