lacking
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lacking
Not present in sufficient quantity or quality; missing or inadequate.
Mangelndes Selbstvertrauen hinderte ihn daran, die neue Herausforderung anzunehmen.
Lacking self-confidence prevented him from taking on the new challenge.
'Mangelnd' (lacking) is the present participle of the verb 'mangeln' (to be lacking). It describes a state in which something is missing or there is 'ein Mangel' (a lack) of something.
Aufgrund mangelnder Beweise wurde der Angeklagte freigesprochen.
Due to a lack of evidence, the defendant was acquitted.
The adjective 'mangelnd' (lacking) is almost always used before a noun (attributively). Using it as a standalone predicative adjective ('Das Interesse war mangelnd' — the interest was lacking) is very rare and sounds unnatural.
Sein mangelnder Ehrgeiz ist das Hauptproblem.
His lack of ambition is the main problem.
'Mangelnd' (lacking) is very often combined with abstract nouns to describe the absence of a quality or resource. Common examples are 'mangelndes Interesse' (lack of interest), 'mangelnde Erfahrung' (lack of experience), and 'mangelndes Wissen' (lack of knowledge).
Die Firma kritisierte die mangelnde Qualifikation der Bewerber.
The company criticized the applicants' lack of qualifications.
scarce / just under / close
'knapp' and 'mangelnd' can both express that there is not enough of something. 'knapp' is often used for things that are available only in a very small amount, but may still just be enough, for example time, money, or space. 'mangelnd' sounds more strongly like a problem or a deficit: there is not enough of something, or the quality is not sufficient. 'Knappes Geld' means you have little money; 'mangelnde Erfahrung' means that there is too little experience, and that causes difficulties.
Wegen mangelnder Vorbereitung hat das Team die Präsentation verschoben.
Because of insufficient preparation, the team postponed the presentation.
Vor der Abfahrt war die Zeit knapp, deshalb haben wir kein Frühstück mehr gekauft.
Before departure, time was short, so we did not buy breakfast anymore.