不一定

bù yī dìng
HSK 2Adverb (副)Adjective (形)

Basic Meaning

adv
Used to express possibility or probability, often to soften a statement or correct an assumption.
not necessarily; not always
未必。
Sentences:
  1. 贵(guì)的(de)东(dōng)西(xi)不(bù)一(yī)定(dìng)好(hǎo)。
    Expensive things are not necessarily good.
  2. 他(tā)说(shuō)要(yào)来(lái)，但(dàn)不(bù)一(yī)定(dìng)什(shén)么(me)时(shí)候(hou)到(dào)。
    He said he would come, but not necessarily when he'll arrive.
adj
Used to describe a state or thing that is not definite or fixed.
uncertain; not sure
不确定。
Sentences:
  1. 明(míng)天(tiān)的(de)天(tiān)气(qì)还(hái)不(bù)一(yī)定(dìng)。
    Tomorrow's weather is still uncertain.
  2. 他(tā)给(gěi)了(le)我(wǒ)一(yī)个(ge)不(bù)一(yī)定(dìng)的(de)回(huí)答(dá)。
    He gave me an uncertain answer.

Characters Breakdown

HSK 1
bù不

no; not

HSK 1
yī一

one

HSK 2
dìng定

stabilize; fixed