
erheblich
considerable
To a large or important extent; substantial, significant.
Die neuen Maßnahmen haben zu einer erheblichen Verbesserung der Situation geführt.
The new measures have led to a considerable improvement in the situation.
considerable
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considerable
To a large or important extent; substantial, significant.
Die neuen Maßnahmen haben zu einer erheblichen Verbesserung der Situation geführt.
The new measures have led to a considerable improvement in the situation.
The word 'erheblich' (considerable) is related to the verb 'erheben' (to raise), which means 'anheben' (to lift) or 'emporheben' (to raise up). Something that is 'erheblich' is therefore 'raised beyond' the normal level and thus significant.
Der Sturm verursachte erhebliche Schäden am Dach.
The storm caused considerable damage to the roof.
'Erheblich' can stand before a noun as an adjective or modify a verb or another adjective as an adverb. As an adverb, it remains unchanged.
Es gibt einen erheblichen Preisunterschied.
There is a considerable price difference.
'Erheblich' is often used to describe the extent of abstract things. Common combinations include 'erhebliche Zweifel' (considerable doubts), 'erhebliche Kosten' (considerable costs), 'ein erheblicher Teil' (a considerable part), or 'erheblicher Einfluss' (considerable influence).
Die Reform hatte einen erheblichen Einfluss auf die Wirtschaft.
The reform had a considerable influence on the economy.
This word belongs more to written language and more formal contexts. You often find it in news, reports, and specialist texts.
Die Untersuchung ergab erhebliche Mängel bei der Sicherheit.
The investigation revealed considerable safety deficiencies.
clear / clearly
Deutlich and erheblich can both describe a substantial increase or decrease. Deutlich places more emphasis on the change being clearly recognizable, whereas erheblich highlights its considerable extent or importance. Use deutlich for visible differences and erheblich when the size of the change is important.

Nach der Renovierung sind die Kosten für das Haus erheblich gestiegen.
After the renovation, the cost of the house had risen considerably.
Nach dem Training ist meine Ausdauer deutlich besser geworden.
After training, my stamina had improved significantly.