Adjective

(er)

Lively or enthusiastic.

She answered with a perky smile and bounced off.

Standing upright; firm.

The plant looks much perkier since I watered it.

perky breasts

Adjective

(er)

Enjoying health and vigor of body, mind, or spirit: well.

*{{quote-book, year=1935, author= George Goodchild

, title=Death on the Centre Court, chapter=5 , passage=By one o'clock the place was choc-a-bloc. […] The restaurant was packed, and the promenade between the two main courts and the subsidiary courts was thronged with healthy -looking youngish people, drawn to the Mecca of tennis from all parts of the country.}}

Conducive to health.

* {{quote-magazine, date=2013-07-19, author= Ian Sample

, volume=189, issue=6, page=34, magazine=(The Guardian Weekly) , title= Irregular bedtimes may affect children's brains , passage=Irregular bedtimes may disrupt healthy brain development in young children, according to a study of intelligence and sleeping habits.  ¶ Going to bed at a different time each night affected girls more than boys, but both fared worse on mental tasks than children who had a set bedtime, researchers found.}}

Evincing health.

(label) Significant, hefty; beneficial.