Weak in body for the time being.

1

1866.  Me and him like to have fit, and perhaps would, if I hadn’t been puny.—C. H. Smith, ‘Bill Arp,’ p. 170.

2

1904.  She got so puny she spit up ever’thing she ate.—W. N. Harben, ‘The Georgians,’ p. 163.

3