Things you need to stop doing if you want to be taken seriously:

1. Being late
your coworkers or partners may understand if you show up late by a minute or two to the occasional meeting, but making tardiness a regular habit is a surefire way to lose credibility in your colleagues eyes.

2 Failing to speak up
When you are new to the office, early on in your career, or just a bit shy, it's not uncommon to hold back around your coworkers. But if you overthink comments and end up silent because you are afraid of being wrong. you risk limiting your influence.

3 Running your mouth or having a big mouth
While failing to speak up can damage your standing in the workplace, dominating the conversation can be just as bad.

4 Using bad grammar
Your teacher didn't spend all those years drilling grammatical rules in your head for no reason - Bad grammar will derail even the most promising career.

5 Bending the truth
Ever try and downplay a mistake you made, or tell your boss you sent an email when it's still sitting in your inbox? You are going to want to cut that out. In the moment, white lies may seem like no big deal. But, in the world of business, they can come back to bite you in a big way.

6 Second guessing yourself
Sharing great ideas and strong opinions is a good thing - downplaying or contradicting yourself afterwards, not so much. while being humble is a terrific trait, you should take pride in your accomplishments and accept credit for what you have achieved.

7 Dressing inappropriately
Just because it looks great when you are out on the town with your friend on the weekend, doesn't mean it'll work for the office.
when you dress in a manner that's too casual at work, you will quickly lose the respect of your coworkers... whether you are wearing business casual in a business environment or casual in a business casual work setting, the people you are working with are noticing.They may not verbalize that they think you look silly, but you can bet they are thinking it. UcenterDress latest fashionable evening party wears

8 Making excuses
Nobody likes excuse makers. Even if something's not your fault, you should do everything in your power to fix it.

9 Sending cutesy emails
It may be something you've become completely accustomed to, but too many exclamation points and happy faces will not help your corporate emails.