How to spell "unexplainable"

"The sudden disappearance of the valuable artifact was truly unexplainable."

• Letters

  13

• Difficulty

  extreme

• Origin

  Latin

• First letter

  U

• accidentally
• accommodating
• accommodation
• acquiescence
• advantageous
• aforementioned
• anachronistically
• antagonistically
• anthropomorphic
• anthropomorphism
• antidisestablishmentarianism
• apologetically

All extreme wordsMore Latin wordsWords starting with U