not closely, not tightly
Он неплотно завернул крышку банки.
He didn't screw the jar lid on tightly.
Дверь была закрыта неплотно.
The door was not fully closed.
Окно закрыли неплотно, и дуло ветром.
The window was not closed tightly, and a draft was coming in.
Крышка неплотно прилегала, и вода вытекала.
The lid was not tightly closed, and water was leaking out.
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