smothered (adj.)

• arcane
• bated
• cabalistic
• censored
• classified
• close
• closed
• concealed
• crushed
• cryptic
• dark
• dead
• deadened
• dull
• dulled
• enigmatic
• esoteric
• flat
• hermetic
• hidden
• hush-hush
• latent
• muffled
• muted
• mysterious
• occult
• quashed
• quelled
• repressed
• restricted
• secret
• smashed
• softened
• squashed
• squelched
• stifled
• subdued
• suppressed
• ulterior
• undisclosed
• unrevealed
• unspoken
• untellable
• untold
• unutterable
• unuttered