(1)不合格的；不能胜任的
指不适合从事某项工作。就父母与子女的关系而言，该术语通常要引入道德懈怠的含义，但这并不是必须的，除了道德缺陷外，任何原因的不适合都会导致父母不适于承担监护之责。

(2)不合格的；不适用的
指商品或服务不适于特定的用途。

• bill of exchange
• bill of gross adventure
• bill of health
• bill of indemnity
• bill of indictment
• bill of interpleader
• bill of lading/B.L./B/L
• bill of Middlesex
• bill of mortality
• bill of pains and penalties
• bill of parcels
• bill of particulars
• bill of peace
• bill of privilege
• bill of proof
• bill of review
• bill of review for error apparent
• bill of revivor
• bill of revivor and supplement
• bill of rights
• bill of sale
• Bill of Sewers
• bill of sight
• bill of store
• bill of stores