大可 / 大不必dàkě / dàbùbì

Perfectly Fine to / No Need at All to: 大可 / 大不必

Meaning: Perfectly fine to / No need whatsoever to

Pattern

"大可" and "大不必" (frequently written as "大可不必") are formal adverbs used to advise or reassure someone:
(1) "大可" (dàkě — may well / feel completely free to): expresses permission or gentle encouragement, assuring the listener that an action is completely reasonable (most commonly "大可放心" — you may rest completely assured).
(2) "大不必 / 大可不必" (dàbùbì / dàkěbùbì — there is no need whatsoever to): strongly negates the necessity of an action, typically advising people not to worry, get angry, or overreact (e.g., 大可不必担心, 大可不必生气, 大可不必大惊小怪).
Unlike "何必" (which is a rhetorical question), "大可不必" is an emphatic declarative statement widely used in social commentary and essays.

1
你大可放心，事情已经妥善处理。
Nǐ dàkě fàngxīn, shìqíng yǐjīng tuǒshàn chǔlǐ.
You may rest completely assured; the matter has already been properly handled.
2
这点小事，大不必放在心上。
Zhè diǎn xiǎoshì, dàbùbì fàng zài xīn shàng.
There is no need whatsoever to take such a trivial matter to heart.
3
他的批评是出于好意，你大可不必生气。
Tā de pīpíng shì chū yú hǎoyì, nǐ dàkě bùbì shēngqì.
His criticism was out of goodwill; there is no need at all for you to get angry.

•大可 most commonly pairs with 放心; 大可不必 / 大不必 often pairs with 担心 / 生气 / 紧张 / 放在心上.

⚠️ Common Mistakes:

•Using 大可 with negative or harmful actions: it normally pairs with reassuring verbs like 放心 or 相信.

•Dropping 不必 from 大可不必 while still intending a negative meaning: 大可 alone is affirmative!

•Confusing the sentence mood of 大可不必 (declarative statement) with 何必 (rhetorical question).

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