precocious (adj.)

• advanced
• ahead
• bright
• developed
• early
• forward
• gifted
• half-baked
• hasty
• ill-considered
• impulsive
• intelligent
• mature
• overhasty
• precipitate
• premature
• previous
• quick
• rushed
• smart
• uncrystallized
• unpremeditated
• unprepared
• unripe
• untimely