1. Totally unlikely
   - impossible, inconceivable, out of the question

See also: unimaginably, unthinkable

• uncomely
• uncomfortable
• uncomfortableness
• uncomfortably
• uncommercial
• uncommercialised
• uncommercialized
• uncommitted
• uncommon
• uncommonly
• uncommonness
• uncommunicative
• uncommunicativeness
• Uncompahgre Peak
• uncomparable
• uncomparably
• uncompartmented
• uncompassionate
• uncompensated
• uncompetitive
• uncomplaining
• uncomplainingly
• uncomplete
• uncompleted
• uncomplicated