Adjective

(en adjective)

Demonstrating thought or careful consideration.

*{{quote-book, year=1959, author=(Georgette Heyer), title=(The Unknown Ajax), chapter=1

, passage=But Richmond, his grandfather's darling, after one thoughtful glance cast under his lashes at that uncompromising countenance appeared to lose himself in his own reflections.}}

Demonstrating kindness or consideration for others.

Adjective

(en adjective)

Outstanding in importance, of great consequence.

* 1725 , , Everybody's Business is Nobody's Business :

The reason why I did not publish this book till the end of the last sessions of parliament was, because I did not care to interfere with more momentous affairs.

* 1831 , , Homeward Bound , ch. 31:

"It has been a momentous month, and I hope we shall all retain healthful recollections of it as long as we live."

* 1902 , , The End of the Tether , ch. 3:

What to the other parties was merely the sale of a ship was to him a momentous event involving a radically new view of existence.

* 2007 July 1, , " Inferior Design," New York Times (retrieved 19 Nov 2013):

Natural selection is arguably the most momentous idea ever to occur to a human mind, because it — alone as far as we know — explains the elegant illusion of design that pervades the living kingdoms and explains, in passing, us.