Top matchCommonWaniKani 9か欠ka かka すsuGodan verb with 'su' ending, Transitive verbto miss (doing); to fail (to do)usu. in the negativeスポーツではチームの和が成功には欠かせません。In sport, team harmony is vital to success.to do withoutusu. in the negativesee 欠かせない Listen Conjugations Pitch on OJAD Explore