The First most Common word used in the world is Incompetent

Definition-not competent; lacking qualification or ability; incapable: an incompetent candidate.

The Second most Common used word in the world is Idiot

Definition-an utterly foolish or senseless person.

The Third Most Common Used Word In The World is ignorant

Definition-lacking in knowledge or training; unlearned: an ignorant man

The fourth most common used word in the world is Honor/Honorable

Definition-High respect, as that shown for special merit; esteem: the honor shown to a Nobel laureate.

The last Most common use word in the world is selfish

Definition-devoted to or caring only for oneself; concerned primarily with one’s own interests, benefits, welfare, etc., regardless of others.