17 letters
- underutilizations32
- undesirablenesses25
- unemployabilities32
- unfashionableness30
- unforgivingnesses32
- unidimensionality28
- uniformitarianism29
- uninhibitednesses27
- unintelligibility30
- universalizations34
- unmelodiousnesses26
- unmitigatednesses26
- unobtrusivenesses28
- unpretentiousness25
- unrighteousnesses25
- unsophistications28
- unsympathetically36
- untranslatability27
- valetudinarianism29
- vasoconstrictions29
- videoconferencing36
- viscoelasticities28
- xeroradiographies32
- zoogeographically42