Synonyms of the word 
STYLELESS → DOWDY - UNSTYLISH
styleless
- adj. Lacking good style or any style at all.
- adj. (botany) Lacking a style (stalk structure).
dowdy
- adj. Plain and unfashionable in style or dress.
- adj. Lacking stylishness or neatness; shabby.
- n. A plain or shabby woman.
unstylish
- adj. Not stylish; unfashionable.
If you are interested in words, visit the following sites :
- wiktionary.org/styleless For complete definition of a word
- 1word.ws/styleless to play with words, suffixs, prefixs, etc.