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.
proud
'stolz' and 'beachtlich' can both show that something is impressive. In connection with numbers, quantities, or prices, they can be close in meaning: 'eine stolze Summe' and 'eine beachtliche Summe' are both high amounts. However, 'beachtlich' is broader and can also describe achievements, progress, or results that deserve recognition. In this meaning, 'stolz' mainly fits with high numbers or prices. Learners may confuse the words because both express something positive or impressive. Remember: 'beachtlich' describes that something deserves attention; 'stolz' often emphasizes a surprisingly high number.

Trotz wenig Training war ihr Ergebnis beim Lauf beachtlich.
Despite little training, her result in the race was considerable.
Für das Konzert kosten die besten Plätze stolze 120 Euro.
For the concert, the best seats cost a considerable 120 euros.