missing (adj.)

• absent
• away
• callow
• defective
• deficient
• departed
• devoid
• embryonic
• extinct
• failing
• gone
• immature
• inadequate
• incomplete
• lacking
• lost
• minus
• negative
• nonexistent
• null
• part
• partial
• patchy
• scant
• scanty
• scrappy
• short
• shy
• sketchy
• underdeveloped
• undeveloped
• vacuous
• vanished
• void
• wanting