资料来源 : pyDict

未得保证的,无把握的,不安全的,未保险的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Unassured \Un`as*sured"\, a.
   1. Not assured; not bold or confident.

   2. Not to be trusted. [Obs.] --Spenser.

   3. Not insured against loss; as, unassured goods.

资料来源 : WordNet®

unassured
     adj : lacking boldness or confidence