必 不 可 少 bì bù kě shǎo : absolutely necessary; indispensable; essential

必 需 bì xū : essential; indispensable

必 要 bì yào : necessary; essential; indispensable; required

病 痛 bìng tòng : slight illness; indisposition; ailment

不 得 勁 bù dé jìn : awkward; unhandy; be indisposed; not feel well

不 可 缺 少 bù kě quē shǎo : indispensable

不 快 bù kuài : be unhappy; be displeased; be in low spirits; be indisposed; feel under the weather; be out of sorts

不 適 bù shì : unwell; indisposed; out of sorts