In Romeo and Juliet, the word "gallant" is often used in a positive sense. For example, Romeo is described as a "gallant youth" (I.i.119), and Juliet calls him a "gallant gentleman" (II.ii.77). In these instances, "gallant" means "brave" or "noble."
However, the word "gallant" can also have a negative connotation in Romeo and Juliet. For example, when Juliet is first introduced, she is described as being "too soon marr'd with her own beauty, / Too fair, too wise, wisely too fair, / To live unstain'd the stain of her own worth, / And wilfully to make much ado / About a pretty piece of flesh" (I.i.106-111). In this instance, "gallant" means "too flashy" or "superficial."
The word "gallant" can also be used in a more general sense in Romeo and Juliet. For example, when the Prince is trying to calm down the feuding families, he says, "Is it more sin to wish me thus forsworn, / Or to dispraise my niece with such a youth / As Romeo, the goodliest man of all Verona?" (III.i.97-99). In this instance, "gallant" simply means "handsome" or "attractive."
Overall, the meaning of the word "gallant" in Romeo and Juliet can vary depending on the context in which it is used. However, it is generally used in a positive sense, meaning "brave," "noble," or "chivalrous."