Another word for weighty

Their influence in these respects was weighty and important.

They hand down the names of the rulers of the several heavens as a weighty secret.

His description of the different kinds of ploughs is interesting; and he justly recommends such as were drawn by two horses (some even by one horse) in preference to the weighty and clumsy machines which required four or more horses or oxen.

They possess few reliable characters; their modifications are not weighty, and it is almost certain that some of these characters, and even combinations thereof, have been developed independently and in different countries.

Lord Birkenhead brought to the performance of his new duties the vigour which had always been characteristic of him; his judgments in the two final Courts of Appeal were weighty and lucid; and he quickly made himself a force in the Lords' debates.