Synonym: mare. Antonym: colt. Similar words: willy-nilly, shilly-shally, dilly-dally, hillbilly, fill, fill in, fill out, fill up. Meaning: ['fɪlɪ] 
n. a young female horse under the age of four.
n. a young female horse under the age of four. 
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31) The young filly needed to be freed from the tree after curiosity got the better of it and it wedged its head between separate sections of the trunk.
32) Filly female horse that is 4 years old or under.
33) Expert comment: This little filly will be the star in the short, symmetrical shape.
34) Do your best to reward those who wait with a beautiful filly to carry on the mare code of honor for the next generation of those who wait!
More similar words: willy-nilly, shilly-shally, dilly-dally, hillbilly, fill, fill in, fill out, fill up, filled, fillip, refill, fulfill, fulfilled, fulfilling, fulfillment, hilly, silly, self-fulfillment, chilly, illegally, billy goat, tranquilly, illogically, skillfully, film, file, filth, filch, defile, filthy.