Curious

Fits when attention and willingness to know more are enough

Careful Interested is passive and much weaker than active curiosity.

Fits when enthusiasm to begin learning is most visible

Careful Eagerness may target action or approval and need not involve understanding.

Fits when attention and participation are demonstrably active

Careful Engagement can follow instructions closely without generating any questions.

Fits when trying possibilities without a fixed conclusion is useful

Careful Exploratory describes an approach more naturally than a person's enduring trait.

Fits when frequent, purposeful questions support learning

Careful Inquisitive can edge toward intrusive questioning if the subject is personal.

Fits when assumptions are examined instead of accepted automatically

Careful Questioning can sound skeptical or oppositional rather than eager to learn.

Fits when evidence is pursued systematically

Careful The word suggests an inquiry or profession, not broad everyday curiosity.

Fits when the goal of acquiring understanding should be explicit

Careful This compound sounds analytical and is clumsy in an affectionate description.