Today's word is "fuan (uneasiness; anxiety; unrest; uncertainty)". It is written with a combiantion of two kanji characters "fu" and "an". The synonym of the word is "shinpai" and the antonym is "anshin". Here are some examples.
* Nani mo fuan ni omou koto wa nai. 何も不安に思うことはない。 --- I have nothing to worry about.
* Kekka ga wakaru made, fuan de tamaranakatta. 結果が分かるまで、不安でたまらなかった。 --- I was overcome with anxiety until I know the result.