不可少 Traditional form: 不可少 Pinyin (reading): bùkěshǎo Definitions: indispensable; essential Characters: 不 - no, not, un-; negative prefix 可 - may, can, -able; possibly 少 - few, little; less; inadequate Traditional characters: 不 - no, not, un-; negative prefix 可 - may, can, -able; possibly 少 - few, little; less; inadequate