not secured, especially not insured against loss, as by a bond or pledge: an unsecured loan.
not made secure, as a door or lock of hair; unfastened.
not protected against tapping or interception, as a telephone line or radio communication.

1770–80; un-1 + secured

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unsecured (ˌʌnsɪˈkjʊəd)
1.  finance
 a.  (of a loan, etc) secured only against general assets and not against a specific asset
 b.  (of a creditor) having no security against a specific asset and with a claim inferior to those of secure creditors
2.  not made secure; loose

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The number of unsecured sources was far higher than the two the government
  reported earlier this week.
Don't use a fanny pack or leave a bag unsecured on the seat next to you in an
  outdoor café.
Let us not forget how inconceivably absent-minded using an unsecured account
  for government communications is in the first place.
The best way to get rid of charge card financial debt is to do it yourself,
  perhaps using a unsecured loan.
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