Adjective

(en adjective)

Extremely persistent and untiring.

*

but he was at the same time an excellent scholar, and most indefatigable in teaching the two lads.

* 1898 , :

All night long the Martians were hammering and stirring, sleepless, indefatigable , at work upon the machines they were making ready, and ever and again a puff of greenish-white smoke whirled up to the starlit sky.

Adjective

(en adjective)

Endowed with life; full of life or spirit; indicating animation; lively; vigorous.

*

, title=(The Celebrity), chapter=8 , passage=The humor of my proposition appealed more strongly to Miss Trevor than I had looked for, and from that time forward she became her old self again;