Senses
狠 resolute
firm; resolute; determined; severe or stern
狠 ruthless
ruthless; fierce; cruel; ferocious; hardhearted
狠 to harden one's heart
to suppress one's feelings to do something difficult or cruel, often used in the form 狠心 or doubled as 狠了狠心
狠 very
old variant of 很 meaning "very" or "quite"