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unstable

unstable

91 4.4
A person whose mood or behavior changes suddenly
  • adjective
  • /ʌnˈsteɪbəl/
translation icon : inestable
  • There needs to be better screening to keep out emotionally unstable individuals.
  • emotionally unstable
  • an unstable family
  • an unstable life

If you are too unstable, if you are not solid,

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Examples

  • Well, now that you mention it, I feel a little unstable up here.

  • Obviously I'm an unstable emotional wreck.

  • There is no room for the sick and the weak and the unstable.

  • Yes, he is also a little mentally unstable and could be violent.

  • I feel so unstable and scared right now, like she's about to just fall at any second.

  • She's completely unstable.

  • He's mentally unstable.

  • Your husband's claiming you're mentally unstable because your father was physically abusive and your mother was an alcoholic who abandoned you.

  • After her recent breakup, she felt emotionally unstable and struggled to control her mood swings.

  • His unstable behavior made it difficult for his friends to know how he would react in any situation.

Synonyms

unpredictable
vsunstable
163 4.4

Likely to change suddenly and hard to know in advance

focuses specifically on emotional and mental sudden changes rather than any event
chaotic
vsunstable
116 4.7

Not organized and full of confusion

is focused on individual emotional unpredictability rather than overall disorder
erratic
vsunstable
94 6.1

Not regular or predictable and likely to change suddenly

is similar but applies specifically to emotional or mental changes
volatile
vsunstable
77 7.0

Likely to change suddenly and become more dangerous

is mainly emotional unpredictability and not necessarily dangerous escalation
moody
vsunstable
50 3.2

Often feels angry or sad quickly for no clear reason

covers unpredictable emotional shifts more broadly, not only sadness or anger
fickle
vsunstable
39 6.2

Changing often in a way you cannot rely on

is about general unpredictability in mood or behaviour rather than loyalty shifts
turbulent
vsunstable
34 6.6

Full of confusion and disorder among people, politics, or events

covers sudden personal mood changes rather than broad confused situations
off balance
vsunstable
34 4.0

Feeling unsteady in body or mind after something sudden

describes ongoing unpredictable mood or behaviour rather than temporary disorientation
capricious
vsunstable
19 7.9

Showing sudden changes in mood, like going from happy to angry

is similar but emphasizes general emotional or mental unpredictability rather than sudden whimsy
temperamental
vsunstable
12 6.5

Tends to change mood suddenly and act in an unexpected way

is about general unpredictability rather than sensitivity driven mood changes
mercurial
vsunstable
7 8.2

Changing mood or behaviour suddenly and without warning

is about broader emotional unpredictability without implying lively temperament
tempestuous
vsunstable
7 8.4

Full of strong, stormy feelings, often with loud arguments

is about unpredictable emotional changes but less about continuous emotional storms
hot and cold
vsunstable
  • Informal
4 6.8

A person who feels interested one moment and not interested the next

is broader, covering any sudden emotional changes not only enthusiasm shifts
fluctuating
vsunstable
6.1

Changing up and down often in a way you cannot guess

is similar but points to sudden mood or mental shifts rather than gradual cycles
a bit switchy
vsunstable
  • UK
9.2

Often changes mood or behavior quickly and without warning

is more general and described in clinical or formal terms

Antonyms

473 2.3

Not likely to change and stays steady over time

How Emotionally Stable

stable
473 2.3
moody
50 3.2
temperamental
12 6.5
unstable
91 4.4
volatile
34 7.4
explosive
233 4.6

Surface Forms

unstable positive
unstabler comparative
unstablest superlative

Morphology

unstable = stable (transparent) = un + stable

Emotionally/mentally 'unstable' is regularly interpreted as 'not stable' in mood/behavior; the negation is productive and interpretable by learners.

Etymology

Unstable comes from un- 'not' plus stable 'standing firm', the same root you see in the word stable. So if a person is unstable their feelings do not 'stand firm' and can change quickly.