We have put together a list of words that are similar to LENGTHINESS.

5 Alternative Words Similar to lengthiness

1 Extension Noun      Synonym Words Like Extension
2 Prolongation Noun      Synonym Words Like Prolongation
3 Duration Noun      Synonym Words Like Duration
4 Longness Noun      Synonym Words Like Longness
5 Fermata Noun      Hyponym

5 definitions of lengthiness

1 The state or quality of being lengthy; prolixity.
2 the consequence of being lengthened in duration
3 amount or degree or range to which something extends
4 The quality of being lengthy; prolixity.
5 The property of being lengthy, longness.
We get our data from many different dictionaries across the web:
Wordnik, Wiktionary, Century, American Heritage, Gcide