Polite is the antonym of having a lack of manners.
An antonym to lacking support could be flimsy.
The antonym for "thoughtful" is "thoughtless," which means lacking consideration or attention to others.
an antonym for credibility is unreasonableness
lacking, rare, scarce, sparse
Inactivity, bad manners, idleness, thoughtlessness, etc.
rude Unmannerly, uncivilized , brutish, crude,
Lacking means that there is a shortage of something; such as someone who is lacking in manners. Devoid means to be completely without something. The words are similar but not exactly the same.
The antonym of convincing is unconvincing, which means not able to persuade or influence someone effectively, lacking the power to sway opinions or beliefs.
"uncouth" means "lacking good manners" The impolite boy was uncouth. uncouth would mean "impolite"
Ignorance is the opposite, or antonym, of knowledge: "The condition of being uninformed or uneducated. Lacking knowledge or information."
Nearsighted is a word. It is the opposite of foresighted.
The antonym of superficial is profound. While "superficial" refers to something shallow or lacking depth, "profound" describes something that is deep, meaningful, or significant. This contrast highlights differences in understanding, importance, or complexity.