Big talking refers to the behavior of someone who talks boastfully or excessively, often without any substance to back up their claims. Antonyms for this term would be modesty, humility or reticence. If someone is modest, they do not draw attention to themselves or their achievements, preferring to be reserved and unassuming. Humility, on the other hand, involves recognizing one's shortcomings and limitations, and not engaging in excessive self-promotion. Reticence refers to being quiet, reserved, and not disclosing too much information. All of these antonyms are more admirable traits than big talking, which is often seen as empty braggadocio.