• akill-less,
• zkill-less,
• xkill-less,
• dkill-less,
• ekill-less,
• wkill-less,
• sjill-less,
• smill-less,
• slill-less,
• soill-less,
• siill-less,
• skull-less,
• skjll-less,
• skkll-less,
• skoll-less,
• sk9ll-less,
• sk8ll-less,
• skikl-less,
• skipl-less,
• skiol-less

The adjective form of "skill-less" is "unskilled".

The plural form of "skill-less" is "skill-lesses".

The singular form of the word "Skill-less" is "Skill-less" itself. The word does not change in its singular form.