1. Not readily apparent
   "the answer was at first unapparent"

See also: unobvious

• Sion
• Siouan
• Siouan language
• Siouan-speaking
• Sioux
• Sioux City
• Sioux Falls
• sip
• Sipah-e-Sahaba
• siphon
• siphon off
• Siphonaptera
• Siphonophora
• siphonophore
• SIPP
• sipper
• sippet
• Sipuncula
• sipunculid
• Siqueiros
• sir
• Sir Alan Hodgkin
• Sir Alec Guinness
• Sir Alexander Fleming
• Sir Alexander Korda