unmaintainable

unmaintainable — adjective

  • unmaintainablepositive
  • more unmaintainablecomparative
  • most unmaintainablesuperlative

1. Describes a system, computer program, building, or process that is designed or b

1.adjectiveB2
Definition

Describes a system, computer program, building, or process that is designed or built in a way that makes it impossible to keep working properly, fix faults, or add improvements without creating new problems.

Example

Theo's team decided to rewrite the application because the old code base had become completely unmaintainable.

become + unmaintainable; software context

The city council admitted the bridge was structurally unmaintainable and needed to be demolished.

passive: was + unmaintainable; infrastructure context

Common collocations
  • become unmaintainable
  • render something unmaintainable
  • declare something unmaintainable
  • completely unmaintainable
  • structurally unmaintainable
  • unmaintainable code
  • unmaintainable system
  • unmaintainable mess
Synonyms
  • unfixable

    more concrete and narrower — focuses on specific faults that cannot be corrected, whereas 'unmaintainable' describes the broader inability to care for the whole system

  • unworkable

    broader — describes any plan or system that cannot function at all, while 'unmaintainable' implies it currently works but cannot be kept working

  • unsustainable

    focuses on resource or effort costs being too high to continue, whereas 'unmaintainable' emphasises design or structural flaws

Antonyms
  • maintainable

    direct opposite — able to be kept in good condition and improved over time

  • manageable

    broader opposite — something that can be handled or controlled, not necessarily maintained technically

Grammar Patterns

become / grow + unmaintainable

declare / consider + object + unmaintainable

Usage Note

Most common in software engineering and IT contexts, where maintainability is a key design goal. Frequently paired with the verbs 'become', 'render', and 'declare'.

Common Mistakes

This code is very unmaintainable.
This code has become completely unmaintainable.
'unmaintainable' is usually used as a result of accumulated problems, not as a simple quality descriptor like 'big' or 'slow'.

Word family

Synonym discussion

Sense: adjective/1

All three synonyms describe something that cannot continue or be corrected, but they differ in focus. 'Unfixable' is the most concrete — it means a specific fault cannot be repaired (e.g. 'The crack in the foundation is unfixable'). 'Unworkable' is broader, meaning a plan or system cannot function at all, regardless of maintenance (e.g. 'Their schedule was unworkable from the start'). 'Unsustainable' emphasises that the cost — in time, money, or resources — is too high to keep going (e.g. 'The company's growth was unsustainable'). 'Unmaintainable' sits between them: the system still works for now, but its design prevents anyone from keeping it that way without causing more damage. A piece of unmaintainable code might run fine today but cannot be safely updated tomorrow.

unfixable ↗unworkable ↗unsustainable ↗

Common collocations

Nouns

Adverbs

Phrases

  • become unmaintainable
  • render something unmaintainable
  • declare something unmaintainable
  • grow unmaintainable

Etymology

LatinFrenchEnglish

Formed in English from the prefix 'un-' (meaning 'not') added to 'maintainable', which itself comes from the verb 'maintain' plus the suffix '-able' (meaning 'capable of being'). 'Maintain' traces back through Old French 'maintenir' to Latin 'manu tenere', literally 'to hold in the hand' — from 'manus' (hand) and 'tenere' (to hold). The negative prefix 'un-' has been used in English since Old English times to reverse the meaning of adjectives.

First known use

1631

1631, in the meaning defined above