Related Clues:

• Very confusing
• Male relation, oddly airy and vague
• Opaque, as an explanation
• Obscure relative by a river
• Like a cloud that's atomic, with nitrogen falling
• Doubtful, pawnbroker given a ring initially
• Hazy sort of explosion nitrogen's put down
• Obscure Sixties spy agency facing heartless state
• “Whereas an ambiguous statement may be vague by accident or intent, an equivocal one is calculatedly ____” (Bill Bryson, Troublesome Words)
• Not easy to see or hear
• Hard to follow, facetiously
• Relation gets a final letter that's cryptic
• Doubtful pawnbroker, right to ring American
• Needing explaining
• Relative by a river, hazy