The word "formal" is an adjective form of the noun form. However, it has the modern connotation of official or decorous.An adjective form of the verb form is "formed" which may be more apt.
apt - competently able. As in: He is an apt student. apt - exactly suitable. As in: an apt reply. apt - naturally disposed to. As in: he is apt to ignore advice. apt - at risk of something unpleasant. As in: She is apt to lose.
It is a neutral connotation.
Negative connotation
It is a negative connotation.
uneasy is negative connotation
A general connotation for infinity is forever, but because connotation is dependent on the individual reader, the connotation varies.
APT
apt or apt's
here is a way to use apt. If she did it once, she is apt to do it again.
Connotation, it combines an adjective with a positive connotation with a verb that has negative connotation.
Negative connotation