From the same as baros; weighty, i.e. (fig) burdensome, grave -- grievous, heavy, weightier.
see GREEK baros
1. properly, i. e. heavy in weight: φορτίον, Matthew 23:4 (in 11:30 we have the opposite, ἐλαφρόν).
2. metaphorically,
a. burdensome: ἐντολή, the keeping of which is grievous, 1 John 5:3.
b. severe, stern: ἐπιστολή, 2 Corinthians 10:10 (others, imposing, impressive, cf. Wetstein at the passage).
c. weighty, i. e. of great moment: τά βαρύτερα τοῦ νόμου the weightier precepts of the law, Matthew 23:23; αἰτιάματα (better αἰτιώματα (which see)), Acts 25:7.
d. violent, cruel, unsparing (A. V. grievous): λύκοι, Acts 20:29 (so also Homer, Iliad 1:89; Xenophon, Ages. 11, 12).