Collins COBUILD Advanced Learner’s Dictionary

un|struc|tured /ʌ nstrʌ ktʃə ^r d/ ADJ Something such as a meeting, interview, or activity that is unstructured is not organized in a complete or detailed way. □  Our aim was that these meetings be unstructured and informal.

un|stuck /ʌnstʌ k/

1 PHRASE If something comes unstuck , it becomes separated from the thing that it was attached to. □  The brown vinyl covering all the horizontal surfaces is coming unstuck in several places.

2 PHRASE To come unstuck means to fail. [mainly BRIT , INFORMAL ] □  Economics comes unstuck when it doesn't take account of the actions of human beings. in AM, usually use come unglued 3 → see also unstick

un|sub|scribe /ʌ nsəbskra I b/ (unsubscribes , unsubscribing , unsubscribed ) VERB If you unsubscribe from an online service, you send a message saying that you no longer wish to receive that service. [COMPUTING ] □ [V ] Go to the website today and you can unsubscribe online.

un|sub|stan|ti|at|ed /ʌ nsəbstæ nʃie I t I d/ ADJ A claim, accusation, or story that is unsubstantiated has not been proved to be valid or true. □  I do object to their claim, which I find totally unsubstantiated. □  …unsubstantiated rumours about his private life.

un|suc|cess|ful /ʌ nsəkse sfʊl/

1 ADJ Something that is unsuccessful does not achieve what it was intended to achieve. □  His efforts were unsuccessful. □  …a second unsuccessful operation on his knee. □  There were reports last month of unsuccessful negotiations between guerrillas and commanders. ●  un|suc|cess|ful|ly ADV [ADV with v] □  He has been trying unsuccessfully to sell the business in one piece since early last year.

2 ADJ Someone who is unsuccessful does not achieve what they intended to achieve, especially in their career. □  Successful people don't spend much more time working than many unsuccessful people do. □ [+ in ] He and his friend Boris were unsuccessful in getting a job.

un|suit|able /ʌ nsuː təb ^ə l/ ADJ Someone or something that is unsuitable for a particular purpose or situation does not have the right qualities for it. □ [+ for ] Amy's shoes were unsuitable for walking any distance.

un|suit|ed /ʌ nsuː t I d/

1 ADJ If someone or something is unsuited to a particular job, situation, or place, they do not have the right qualities or characteristics for it. □ [+ to ] He's totally unsuited to the job. □ [+ to ] The snow cruiser proved hopelessly unsuited to Antarctic conditions.

2 ADJ If two people, especially a man and a woman, are unsuited to each other, they have different personalities or interests, and so are unlikely to have a successful relationship. □ [+ to ] By the end of that first year, I knew how totally unsuited we were to each other.

un|sul|lied /ʌ nsʌ lid/ ADJ If something is unsullied , it has not been spoiled or made less pure by the addition of something unpleasant or unacceptable. [LITERARY ] □  She had the combined talents of toughness, intellect, experience and unsullied reputation. □ [+ by ] He smiled, unsullied by doubt.

un|sung /ʌ nsʌ ŋ/ ADJ Unsung is used to describe people, things, or places that are not appreciated or praised, although you think they deserve to be. [WRITTEN ] □  They are among the unsung heroes of our time.

un|sup|port|ed /ʌ nsəpɔː ^r t I d/