Speaker's conviction with 〜た+つもり
Grammar: Unexpected » 〜た+つもり
After a past-tense verb, つもり can say that someone acted under the belief that they had done something, even when reality differs: “thinking that I had ~”.
Further Reading
- "2) verb ta-form" [How to use つもり] (maggiesensei.com)
Examples
Suppressed presence with 〜た+つもり
Grammar Explanation: Speaker's conviction with 〜た+つもり (Future entry)

While changing into her uniform, Rize hid in the closet when she sensed someone unfamiliar nearby. Cocoa, feeling as though she was being watched, opened the closet door.
- ココア:
- 「下着姿
( の…ドロボーさん?」- “A burglar… in their underwear?”
- リゼ:
- 「完全
( に気配( を殺( してたつもりなのに」- “I thought I completely suppressed my presence, and yet...”