1. Not capable of being changed or altered
   - unalterable

See also: final, incurable, last

• three-year-old
• three-year-old horse
• threefold
• threep
• threepence
• threepenny
• threescore
• threesome
• threnode
• threnodist
• threnody
• threonine
• thresh
• thresh about
• thresher
• thresher shark
• thresher's lung
• threshing
• threshing floor
• threshing machine
• threshold
• threshold element
• threshold function
• threshold gate
• threshold level