adjective.
Lacking worldly experience and understanding, especially.
adjective.
Simple and guileless; artless.
adjective.
Unsuspecting or credulous.
adjective.
Showing or characterized by a lack of sophistication and critical judgment.
adjective.
Not having experienced or been subjected to something, as.
adjective.
Not previously subjected to experiments.
adjective.
Not having previously taken or received a particular drug.
noun.
One who is artless, credulous, or uncritical.