occurring, coming, or done too soon

a premature announcement.

mature or ripe before the proper time.

a premature infant.

adjective

backward , delayed , late , mature , overdue , careful , cautious , prepared , slow

adjective

a bit previous , abortive , early on , embryonic , forward , green * , immature , incomplete , inopportune , overearly , oversoon , precipitate , predeveloped , previous , raw * , soon , unanticipated , undeveloped , unfledged , unripe , untimely , half-baked * , half-cocked , hasty , ill-considered , jumping the gun , overhasty , too soon , precocious , anticipatory , early , prevenient , unready , unseasonable