
solide
solid
Stable, firm, and well made; of durable, robust quality.
Das Haus ist auf einem soliden Fundament gebaut und hat schon viele Stürme überstanden.
The house is built on a solid foundation and has already withstood many storms.
solid
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solid
Stable, firm, and well made; of durable, robust quality.
Das Haus ist auf einem soliden Fundament gebaut und hat schon viele Stürme überstanden.
The house is built on a solid foundation and has already withstood many storms.

solid
Thorough, well-founded, and of good quality, referring to abstract things such as knowledge, work, or finances.
Für diese Stelle benötigen Sie solide Kenntnisse in der Buchhaltung.
For this position, you need solid knowledge of accounting.

solid
Reliable, decent, and sensible in character and behavior.
Er ist ein solider Handwerker, der seine Arbeit immer pünktlich und ordentlich erledigt.
He is a solid craftsman who always completes his work on time and properly.
'Solide' (solid) always has a positive connotation. It describes something that is reliable, well made, and of lasting quality, whether it refers to a thing, a skill, or a person.
Das Unternehmen hat im letzten Jahr solide Gewinne erzielt.
The company generated solid profits last year.
In its basic meaning, 'solide' (solid) describes physical objects that are stable and well built. Typical nouns are 'Fundament' (foundation), 'Bauweise' (construction method), 'Möbel' (furniture), or 'Material' (material).
Der Tisch ist aus solidem Eichenholz gefertigt.
The table is made of solid oak.
When applied to knowledge or skills, 'solide' (solid) means that something is thorough and reliable. Common combinations are 'solide Kenntnisse' (solid knowledge), 'eine solide Ausbildung' (a solid education/training), or 'eine solide Grundlage' (a solid foundation).
Sie verfügt über solide Grundkenntnisse der deutschen Grammatik.
She has solid basic knowledge of German grammar.
When a person or their work is described as 'solide' (solid), it means they are reliable, honest, and of good quality. For example, people speak of 'einem soliden Handwerker' (a solid craftsman) or 'einer soliden Leistung' (a solid performance).
Er ist ein solider Mitarbeiter, auf den man sich immer verlassen kann.
He is a solid employee whom you can always rely on.
sure / safe
Sicher and solide can both describe an investment positively. Sicher emphasizes low risk or protection against loss, but does not guarantee complete freedom from risk. Solide focuses more strongly on the investment being financially sound and sustainable. Use „sicher“ when talking about the risk of loss and „solide“ when talking about the investment’s overall quality.

Die Anlage gilt als solide, weil sie finanziell vernünftig geplant ist, auch wenn ein gewisses Risiko bleibt.
The investment is considered solid because it is financially soundly planned, even though some risk remains.
Die Anlage gilt als sicher, weil das Geld breit verteilt und vor großen Verlusten geschützt ist.
The investment is considered safe because the money is widely diversified and protected against major losses.