1. Not open to challenge
   "unchallengeable facts"; "a position of unchallengeable supremacy"

See also: noncontroversial, uncontroversial

• loss
• loss adjuster
• loss leader
• loss of consciousness
• loss ratio
• losses
• lossless
• lossy
• lost
• lost cause
• lost property
• Lost Tribes
• lost-and-found
• lot
• Lot's wife
• lota
• Lota lota
• Lotario di Segni
• loth
• Lothario
• Lothian Region
• Lothringen
• loti
• lotic
• lotion