Another word for kindly beginning with 'b' is benevolent.
booing
boffo, bizarre
Blunt
That would be bisecting.
When the word air means to air out, then the word beginning with B is bare (like when someone bares their soul).
Could it be "bud"?
Dweeb is a 5 letter word. It means a person who is socially awkward.
bisect
BEDECK (TG says so)
A b-word is any of a group of words beginning with B which may be considered rude or vulgar.
bauble