The adjective ajar describes something that is slightly open. A door that has been left ajar is easily pushed open by the wind or a nosy person.

Pronunciation: /ə'dʒɑr/
English description: slightly open
Synonyms: unfastened
Chinese Translation: 半开的(ban4 kai1 de)
Spanish Translation: to crumple
ORIGIN: To correctly pronounce ajar, say "uh-JAR." People in a hurry leave drawers and cabinet doors ajar, or hanging open. If a chime starts ringing when you start a car, a door or the trunk may be ajar. Check that everything is securely closed before taking off. But don't describe a mouth that is open in surprise as ajar. A better word choice is agape.

EXAMPLE SENTENCE:

But when the officers went to the apartment from which the call had been placed, they found it empty, with the door left ajar.
He testified that he arrived at the apartment to find the door ajar and that he walked down the hall to Willingham’s bedroom.

*New word description, story and part of "EXAMPLE SENTENCE" are cited in Vocabulary.com