Word: 

Words and phrases that rhyme with fastly:  (9 results)
2 syllables:
astley, gastly, ghastly, lastly, vastly
3 syllables:
handfastly, rick astley, steadfastly, stedfastly
Words and phrases that almost rhyme †:  (2 results)
2 syllables:
ash-grey, daftly
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