• cuin,
• cumen,
• cwin,
• xu in,
• vu in,
• fu in,
• du in,
• cy in,
• cj in,
• ci in,
• c8 in,
• c7 in,
• cu un,
• cu jn,
• cu kn,
• cu on,
• cu 9n,
• cu 8n,
• cu ib,
• cu im

The adjective form of "Cu in" is not commonly used in English. "Cu in" is actually an abbreviation for "cubic inch," a unit of volume used to measure the displacement of an engine. However, if you are referring to "cu" as an abbreviation for "see you," then the adjective form would be "cute" (e.g., "She is a cute person").

The plural form of "cu in" is "cu ins".

The singular form of "cu in" is "cubic inch"