Pronunciation: [ʌnstˈe͡ɪbə͡l] (IPA) 
The word "unstable" is spelled with a "u" followed by a "n" and then the "st" consonant cluster. This "st" cluster is pronounced [st], as in the word "stop". The following "a" is pronounced as /ə/ or "uh" as in "the" and the "b" is pronounced as a voiced bilabial plosive [b]. Finally, the "le" at the end is pronounced as /əl/ or "uhl". Overall, the IPA transcription of "unstable" is [ʌnˈsteɪbəl].
The term "unstable" is an adjective that denotes a condition or situation lacking stability, firmness, or steadiness. It refers to something that is not firmly fixed, either physically, mentally, emotionally, or in terms of its state or condition.
When applied to objects or structures, "unstable" indicates a tendency to easily change or shift, lacking balance or solidity. It suggests a lack of durability or resistance, signifying a vulnerable or weakened state. This could refer to a physical element, such as an unstable table that wobbles when pressure is applied, or an unstable structure, like a building with a weakened foundation that is prone to collapsing.
In the context of a person's mental or emotional state, "unstable" describes an individual who lacks consistency, reliability, or emotional equilibrium. It signifies someone who experiences frequent and unpredictable mood swings, sudden changes in behavior, or difficulty maintaining emotional control. This could be related to a psychological condition, such as bipolar disorder or borderline personality disorder, which causes unstable emotions, thoughts, and relationships.
Another interpretation of "unstable" pertains to a volatile or unpredictable situation, such as political instability, economic instability, or social instability. It signifies a lack of order, consistency, or predictability within a specific societal, political or economic context, often leading to uncertainty, unrest, or insecurity.
Overall, the term "unstable" refers to a lack of stability, whether it involves physical elements, emotional or mental states, or broader situations and environments.
Not steady; inconstant; irresolute; wavering.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
* The statistics data for these misspellings percentages are collected from over 15,411,110 spell check sessions on www.spellchecker.net from Jan 2010 - Jun 2012.
The word "unstable" originates from the Latin word "instabilis", which itself is a combination of the prefix "in" meaning "not", and the word "stabilis" meaning "steadfast" or "firm". In Latin, "stabilis" is derived from the verb "stare", meaning "to stand". Therefore, the etymology of "unstable" conveys the sense of something that is not able to remain in a steady or secure position, lacking firmness or steadiness.
