無し

In a sentence

• この商品は保証無しです。

  This product comes without a warranty.

  The word '無し' is used to indicate the absence of something (a warranty in this case).

• 彼は理由無しに怒った。

  He got angry without reason.

  Here, '無し' indicates the lack or absence of a reason.

• その提案はリスク無しではありません。

  That proposition is not without risks.

  In this case, '無し' is paired with 'ではありません' to express that risks exist, refuting absence.