1. Can emit sparks or burst into flame

See also: combustible

• unconstipated
• unconstitutional
• unconstitutionally
• unconstrained
• unconstraint
• unconstricted
• unconstructive
• unconsumed
• unconsummated
• uncontaminated
• uncontaminating
• uncontested
• uncontrived
• uncontrollable
• uncontrollably
• uncontrolled
• uncontroversial
• uncontroversially
• unconventional
• unconventionality
• unconventionally
• unconverted
• unconvertible
• unconvinced
• unconvincing