VIABLE - [adjective] able to succeed without any problems
Examples of use
Your idea is interesting, but not viable due to the lack of money for carrying it out.
Many innovations are still scientists' dreams, they are not viable to bring them to reality yet.
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English speaking practise
Remember that if you don't use that word in English conversations or writing you'll forget it in a short time. So the best thing you can do to learn this word is just trying to use it in speaking or writing. Remember also that practise is the key to fluent english speaking.
You can always find a partner, who would also like to improve his/her