Indeterminate: Lacking a clear or fixed definition.

Inexpressible: Impossible to articulate in words.

Unstated: Not formally expressed or communicated.

Implicit: Understood without being directly stated.

Ambiguous: Open to multiple interpretations; unclear meaning.

Undefined: Not clearly defined or specified yet.

Concealed: Hidden from direct declaration; not revealed.

Obscure: Difficult to understand or perceive distinctly._

. Vague : Lacking precision, clarity, and specificity._

. Non-assertive : Avoiding definitive statements about existence.__

**Non-declarable item**: An object that cannot be formally declared.

**Non-declarable concept**: An idea not subject to formal declaration.

**Non-declarable situation**: A circumstance unable to be officially stated.

**Legal non-declaration**: Status lacking formal legal acknowledgment or announcement.

**Tax non-declarability**: Income or asset exempt from tax reporting requirements.

**Cultural non-declaration**: Traditions unrecognized by official cultural entities.