Peaky is a synonym of scrawny.
As adjectives the difference between peaky and scrawny
is that peaky is sickly; peaked while scrawny is thin, malnourished and weak.
peaky
English
Adjective
(er)
Sickly; peaked.
Characterised by peaks.
scrawny
English
Adjective
(er)
Thin, malnourished and weak.
Synonyms
* See also
References