Synonyms of the word 
AUSTERENESS → PLAINNESS - SEVERENESS - SEVERITY
austereness
- n. The state of being austere; harshness or astringent sourness to the taste; acerbity.
- n. The state of being austere; severity; strictness; austerity.
plainness
- n. (uncountable) The condition of being plain (in all senses).
- n. (countable) The product or result of being plain.
severeness
- n. The property of being severe.
severity
- n. The state of being severe.
- n. The degree of something undesirable; badness or seriousness.
If you are interested in words, visit the following sites :
- wiktionary.org/austereness For complete definition of a word
- 1word.ws/austereness to play with words, suffixs, prefixs, etc.