The phrase "assertive and firm" is correct and usable in written English.
It can be used when describing someone's communication style or approach, particularly in situations that require confidence and decisiveness.
Example: "In negotiations, it is important to be assertive and firm to ensure your needs are met."
Alternatives: "confident and resolute" or "decisive and strong".
Examples of this could include assertive body language (looking the bully firmly in the eye while standing straight), an assertive tone of voice (clear and firm without sounding threatening) and assertive choice of words such as "I've recently noticed signs that you are trying to bully me and want this behaviour to stop".
Ditch all that hardball stuff from the 80's -- being assertive, standing firm -- and learn to hold your tongue, stammer and couch what you say.
Be assertive, firm and above all, be downright honest.
Convincing someone that they need something you're selling requires that you balance sincerity with your desire to make the sale, being assertive, firm, and honest.
She is very assertive, very firm, but doesn't leave them feeling sullen and resentful". When Rice rescheduled her trip to Cairo last month, she used it to give the first speech by a senior U.S. official on Arab soil that challenged Arab leaders to embrace democracy.
Be assertive, firm, direct, and consistent.
Be assertive and maintain a calmed attitude, remember to maintain a firm tone of voice, don't frighten out.
My taste test tells me that I would be just as happy with Utz Cheese Curls, a working-class puff with a decent enough cheddar flavor (much better than the Jax Real Cheddar Cheese Curls, with their odd, slightly medicinal, licorice aftertaste), or with Wise Crunchy Cheez Doodles, a straight-down-the-middle, classic doodle, with an assertive cheese flavor, firm crunch, and not too much salt.
So students should be assertive and flexible.
