naive

Lacking worldly experience and understanding, especially.

Simple and guileless; artless.

Unsuspecting or credulous.

Showing or characterized by a lack of sophistication and critical judgment.

Not having experienced or been subjected to something, as.

Not previously subjected to experiments.

Not having previously taken or received a particular drug.

One who is artless, credulous, or uncritical.

Simple; unsophisticated; ingenuous; artless.

In philosophy, unreflective; uncritical.