DISHONEST - [adjective] not honest - behaving and acting in a way that makes people not trust you
Examples of use
I finally discovered my husband's dishonest way of making money and we decided on the divorce.
I wouldn't lend him money if I were you. He's dishonest and I'll bet that he won't give it back.
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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