1. Capable of being thought about
   "space flight to other galaxies becomes more cogitable"
   - ponderable

See also: thinkable

• undigested
• undignified
• undiluted
• undiminished
• undimmed
• undine
• undiplomatic
• undiplomatically
• undirected
• undiscerning
• undischarged
• undiscipline
• undisciplined
• undisclosed
• undiscouraged
• undiscoverable
• undiscovered
• undiscriminating
• undisguised
• undismayed
• undisputable
• undisputed
• undisputedly
• undissolved
• undistinguishable