
beachtlich
considerable
So large, good, or impressive that it deserves attention or recognition; remarkable or substantial.
Sie hat in kurzer Zeit einen beachtlichen Wortschatz aufgebaut.
She has built up a considerable vocabulary in a short time.
considerable
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considerable
So large, good, or impressive that it deserves attention or recognition; remarkable or substantial.
Sie hat in kurzer Zeit einen beachtlichen Wortschatz aufgebaut.
She has built up a considerable vocabulary in a short time.
The word is made up of the prefix 'be-', the verb 'achten' (to pay attention to), and the ending '-lich' (-ly/-able). Something that is 'beachtlich' (considerable) therefore literally deserves attention and recognition.
Er hat in nur einem Jahr beachtliche Fortschritte gemacht.
He has made considerable progress in just one year.
'Beachtlich' (considerable) belongs more to elevated or written language. It sounds more formal and appreciative than colloquial expressions.
Die Autorin verfügt über ein beachtliches Wissen auf ihrem Fachgebiet.
The author has considerable knowledge in her field.
'Beachtlich' (considerable) is often used to describe achievements, quantities, or successes. Typical combinations are 'eine beachtliche Leistung' (a considerable achievement), 'ein beachtlicher Erfolg' (a considerable success), or 'eine beachtliche Summe Geld' (a considerable sum of money).
Das Unternehmen erzielte im letzten Jahr einen beachtlichen Gewinn.
The company achieved a considerable profit last year.
considerable
Erheblich and beachtlich can both express a significant size or increase. Erheblich is usually an objective statement about the extent, whereas beachtlich also suggests recognition or admiration. Use erheblich for a neutral assessment and beachtlich when the achievement or development is impressive.

Die Zahl der Beschwerden sank trotz der Krise beachtlich.
The number of complaints fell significantly despite the crisis.
Die Zahl der Beschwerden stieg in diesem Jahr erheblich.
The number of complaints increased considerably this year.