Definition of "umbrageous"

[…] What tho' his Forests wave / Umbrageous to the Gale, and Nature walks / In loose Luxuriance o'er his native Plains; / Those Forests wave, those Plains delight no more; / […]

1766 June 5, “An Exercise, containing a Dialogue, and two Odes, performed at the public Commencement in the College of Philadelphia, May 20, 1766”, in The Pennsylvania Gazette‎, page 2

Not a single one of those "umbrageous trees," of which our Mayor declaimed so feelingly, has yet been planted; […] They should protest against his withdrawal from that station, until the banks of the Monongahela and Duquesne Way are once more covered with "umbrageous trees," […]

1838 June 9, “The City Improvement Candidate”, in The Daily Pittsburgh Gazette‎, page 2

... without which the stem could not have supported its heavy and umbrageous top.

1858, R M Ballantyne, The Coral Island

Rhodes gazed wistfully into the dense umbrageous tangle whence his host had disappeared.

1891, Mary Noailles Murfree, In the "Stranger People's" Country, Nebraska, published 2005, page 130

Not far away was the bank of a canal, bordered by a magnificent avenue shaded by a double row of immense umbrageous trees.

1898, Garrett Putman Serviss, Edison’s Conquest of Mars

A movement in the umbrageous undergrowth betrays the presence of something leaping from the ferns.

2018, Tim Flannery, Europe: A Natural History, page 52