1. (of theories etc) incapable of being defended or justified
   - indefensible

See also: unreasonable

• sheath
• sheath knife
• sheath pile
• sheathbill
• sheathe
• sheathed
• sheathing
• sheave
• shebang
• Shebat
• shebeen
• shed
• shed blood
• shed light on
• shedder
• shedding
• shedload
• sheen
• sheeny
• sheep
• sheep bell
• sheep botfly
• sheep dip
• sheep fescue
• sheep frog