An unprincipled person follows no moral code, has no integrity, and should not be trusted, like the guy who offers to help an old lady across the street but steals her purse instead.

No, unprincipled isn't a word we use to describe a school that's missing its principal — we're talking about the -ple word here. If you don't have principles, which is what unprincipled really means, then you don't have scruples or morals. You're likely to do just about anything bad, like break rules, take advantage of people, tell lots of lies, and extort people's lunch money.

Definitions of unprincipled
  1. adjective
    lacking principles or moral scruples
    “"freedom from coarse unprincipled calumny"- A.E.Stevenson”
    synonyms: amoral
    without scruples or principles
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    based on or manifesting objectively defined standards of rightness or morality
    having high principles
    having scruples; arising from a sense of right and wrong; principled
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  2. adjective
    having little or no integrity
    dishonorable, dishonourable
    lacking honor or integrity; deserving dishonor
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