Words That Rhyme With "Keenness" :

2 syllables:

Enos, freeness, genus, leanness, minas, venous, Venus, weeness

3 syllables:

dominus, Maecenas, Salinas, saphenous, scalenus, silenus, subgenus, uncleanness

4 syllables:

intravenous

6 syllables:

arteriovenous