蹊跷 (qīqiāo): odd

Meanings

Zhè jiàn shì yǒudiǎn qīqiāo.

There's something fishy about this.

Tā juéde duìfāng de xíngwéi hěn qīqiāo.

He felt the other person's behavior was very strange.

usage

蹊跷 implies suspicion — something is not just strange, but suspiciously so. Often used in mystery or crime contexts.

蹊 qī

跷 qiāo