Meanings of grew faintly in English

The western mountain-tops reddened under the rising sun; the sky grew faintly bluer.

Then, with the thought that she would, must still see him sometimes, all again grew faintly glamorous.

The colour rose to her face and her eyes grew faintly troubled, then a proud light flashed in them.

William, who did not suspect the presence of the dog, grew faintly alarmed, but I persevered till the last man staggered surfeited from the feast.