To offer candid and forthright advice or criticism selflessly, even if it's difficult or unwelcome, for the benefit of a cause or an organization.
他向来以蹇谔匪躬的精神，对团队的决策提出真诚的建议，从不考虑个人得失。
He always, with a spirit of selfless and forthright counsel, offers sincere advice on team decisions, never considering personal gains or losses.
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