1. Extremely modest or shy
   "cheerfully bearing reproaches but shamefaced at praise" 
2. Showing a sense of shame
   - sheepish 
3. Showing a sense of guilt
   "the hangdog and shamefaced air of the retreating enemy"
   - guilty, hangdog, shamed

See also: ashamed, modest, shamefacedly, shamefacedness

• sesquipedalia
• sesquipedalian
• sesquipedality
• sess
• sessile
• sessile polyp
• sessile trillium
• session
• session cookie
• sessional
• Sessions
• sesterce
• sestertius
• sestet
• sestina
• set
• set ablaze
• set about
• set afire
• set aflame
• set ahead
• set ashore
• set chisel
• set decoration
• set down