I assume you are manually submitting your website to various directories? most directories allow for anywhere from 250-500 characters in the description field. use them all.
I have dozens and dozens of different descriptions by changing things around a bit, adding new descriptive phrases and keywords - google doesn't want to see the same old title or description again and again for your website; use a lot of variety - and use some Action words too: learn, discover, find, read, see, read about, read up on, check out, browse through, discover.....
heck, use a thesaurus to find out different synonyms for some of your descriptive words and phrases; vary the Title too, a lot, it's not as easy to make up so many varieties because you have more limited space in the Title field but you can work on that with the singular and plural of main keywords in the Title (and in the descriptions etc)
your website/description could: present, gives, offers, furnishes, impart, supplies, features, complete overview, defines, reviews, has analyses, ample info, extensive, plenty of information, etc etc
use plenty of variety in your titles and your descriptions, it pays off as google will tend to like that and not consider it 'duplicate content/description'