conjunction
BAD : I don't like shopping however I'll come with you.
GOOD : I don't like shopping but I'll come with you.
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Unlike but, however is an adverb (NOT a conjunction) and is used only in formal styles: 'I was hoping to deal with this matter quickly. However, the situation is more complicated than I thought.' 'The newspapers always carried stories of new advances and glorious victories. In reality, however, the war was not going well.'
See also NEVERTHELESS (↑ nevertheless ), THEREFORE 1 (↑ therefore )