Why you should stop saying "I think" if you want to sound confident while speaking
We all do it, but it might be watering down what we're really trying to say.

Here's what recommended instead.
Clear, effective communication is just as much about what you don’t say as it is about what you do say. It’s incredibly easy for a message to get watered down with filler words and passive phrases, many of which we use on a daily basis.
Case and point: “I think” statements. Sure, this seems like a harmless option. Logical even. After all, it’s honest. Certain factors have led you to think this or that is the right choice, and thus, you are saying so. But as CNBC Make It contributor Lorraine K. Lee explains, overuse of these two well-intentioned words can “diminish your presence and undermine your confidence.”
In fact, Lee lumps “I think” in with “just,” “sorry” and “maybe,” which are more well-known examples of minimizing language, aka passive qualifiers that lessen the meaning of what you're trying to communicate, rather than enhance it. She notes that however "polite" these phrases seem, etiquette comes at the cost of credibility.
Specifically, “I think” can make an opinion, however well informed, come across as nothing more than a passing thought, and therefore not taken seriously. Or it can make the speaker seem “hesitant” of their own perspective.
So instead, Lee recommends swapping “think” for “I recommend,” which conveys the same meaning but is more “action-oriented” and “decisive.” An example she uses is saying “I recommend trying this restaurant,” rather than “I think you should try this restaurant.“
Lee advises that this swap be used in times when you aren’t all that confident as well, with some added caveats for transparency. Using “from my experience, I’d recommend…” for example. It’s easy to see how you can be upfront about uncertainties, while still clearly communicating your stance.
Things get further conflated when you think about how many people use “I feel statements” when they mean to use “I think statements.” “I feel like this restaurant is better than the other one.” “I feel that you should go with this plan.” “I feel like this isn’t the most productive use of our time.” This is not only grammatically inaccurate, as these are opinions one thinks, not feels, but it also pacifies an already weakened version of what you’re trying to say in the first place.
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So, how do we really develop this better speaking habit? Lee recommends (see what we did there?) first listening for when and where those “I think” statements tend to pop up. You can even ask for the folks around you to help keep you accountable. She also suggests allowing for a pause before speaking, which gives you time to make the mental swap before saying anything out loud. And since most of us type exponentially more than we speak, be sure to make those swaps in written communications as well.
Bottom line; it’s easy for us to go on autopilot with our language. That, plus a desire to not come across as pushy or domineering, can cause us to not really say what we mean. But if we want to be understood, we need to be intentional with what we say, or don’t say.