Synonyms for Impenetrable

Synonyms starting with letter H

• hard

  dense, impervious, complex
• heavy
• hidden

  incomprehensible
• hermetic

  impassable, dense
• hazy
• hardened
• hermetically sealed

  waterproof
• heaped
• heavenly
• habituated
• hard-boiled
• hardhearted
• heartless
• hard-bitten
• hard-as-nails
• hard as nails
• hardy
• hard-handed
• hardboiled
• hidebound
• heroic
• heavier
• hardest
• hard-nosed
• hard-edged
• hard to follow
• humble
• hard to understand
• hushed
• huge