A suffix that can be added to "girlish" is "-ly," forming the word "girlishly."

No. The word "girly" (of or like a girl) is actually an adjective. The form "acting girly" is closer to a linking verb. There is an adverb form, which is "girlishly" but it is not used in the same context.

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern GI---S-L-. That is, nine letter words with 1st letter G and 2nd letter I and 6th letter S and 8th letter L. In alphabetical order, they are:

girlishly

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 9 words with the pattern -I--ISH--. That is, nine letter words with 2nd letter I and 5th letter I and 6th letter S and 7th letter H. In alphabetical order, they are:

finfishes

girlishly

piedishes

pigfishes

piggishly

pinfishes

sickishly

tigrishly

wimpishly

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 9 words with the pattern ---L--H-Y. That is, nine letter words with 4th letter L and 7th letter H and 9th letter Y. In alphabetical order, they are:

bullishly

dollishly

dullishly

foolishly

girlishly

hellishly

stylishly

twelfthly

unfleshly