1. Incapable of being perceived or known
   - incognoscible, incognisable [Brit]

See also: imperceptible, unperceivable

• triphthongal
• tripinnate
• tripinnated
• tripinnatifid
• triplane
• triple
• triple cream
• triple crème
• Triple Frontier
• triple jump
• triple play
• triple point
• triple sec
• triple time
• triple-crown
• triple-crown season
• triple-decker
• triple-space
• triple-spacing
• triple-tongue
• triplet
• triplet code
• tripletail
• Tripleurospermum
• Tripleurospermum inodorum