Option A: infantile – means childish or immature in a negative sense, hence it conveys disapproval.
Option B: charlatan – means a fraud or impostor, clearly disapproving.
Option C: imbecile – means a very foolish or stupid person, also a disapproving term.
Option D: childlike – means having positive qualities of a child, such as innocence or simplicity, not a disapproving term.
Option E: awful – means very bad or unpleasant, again a disapproving term.
Thus, the only option not expressing disapproval is childlike.
\fbox{\parbox{0.97\linewidth}{
\centering The word not expressing disapproval $=\boxed{\text{childlike}}$.
}}