Webster's Revised Unabridged Dictionary · 1913

deprecate

deprecate (dep"re*kāt) , transitive verb

[Latin deprecatus, past participle of deprecari to avert by prayer, to deprecate; de- + precari to pray. See Pray.]

To pray against, as an evil; to seek to avert by prayer; to seek deliverance from; to express deep regret for; to desire the removal of. [archaic]
2.
To protest against; to advance reasons against.
His purpose was deprecated by all round him, and he was with difficulty induced to adandon it. — Sir W. Scott
3.
To disapprove of strongly; to express a low opinion of.