不買 is read as ふばい (fubai) and means not buying.
ふばい
fubai
ふばいうんどう
boycott
ふばいどうめい
ふきょうをかう
to fall into disgrace with
ふじゅうぶん
insufficient
まずい
ugly
ふめい
unknown
ふあん
anxiety
ふせい
injustice
ふそく
dissatisfaction
ふさく
low quality (e.g. of literary works)
ふほんい
reluctant
ぶきみ
weird