ninmari
A knowing, self-satisfied smile when things go according to plan or you have a secret advantage. Slightly mischievous.
💡Used when someone smiles smugly after a successful scheme, finds a good deal, or knows something others don't.
テストの結果を見て、にんまりと笑みを浮かべた。
He grinned smugly when he saw his test results.
She smiled ___ after finding the last piece of cake in the fridge.
冷蔵庫に最後のケーキを見つけて、___と笑った。