Synonyms and related words :
a bit previous, advanced, ahead, bright, developed, early, far ahead, forward, gifted, half-baked, half-cocked, hasty, ill-considered, impulsive, intelligent, mature, not firm, overhasty, oversoon, precipitate, premature, previous, quick, rushed, smart, soon, too early, too soon, uncrystallized, unjelled, unmatured, unmeditated, unpremeditated, unprepared, unripe, untimely