
schlicht
plain / simple
Simple in form, without decoration or elaborate details; unobtrusive and understated in style.
Sie trägt am liebsten schlichte, einfarbige Kleidung.
She prefers to wear plain, solid-colored clothing.
simple / plain
Loading your saved state.

plain / simple
Simple in form, without decoration or elaborate details; unobtrusive and understated in style.
Sie trägt am liebsten schlichte, einfarbige Kleidung.
She prefers to wear plain, solid-colored clothing.

simply / downright
Used as an adverb for emphasis and means 'simply', 'flat-out', or 'downright'.
Seine Aussage war schlicht gelogen.
His statement was simply a lie.

simple
Simple and easy to understand; not complicated or complex.
Die schlichte Wahrheit ist, dass wir uns das Projekt nicht leisten können.
The simple truth is that we can't afford the project.
The meaning of 'schlicht' (simple/plain) changes depending on its function in the sentence. As an adjective before a noun, it describes something as simple and unobtrusive. As an unchanged adverb before another word (often an adjective or verb), it acts as an intensifier and means 'simply' or 'downright'.
Das Restaurant ist für sein schlichtes, aber elegantes Ambiente bekannt.
The restaurant is known for its simple but elegant atmosphere.
When 'schlicht' (plain/simple) describes a simple style, it is often associated with design, art, and fashion. Typical combinations are 'schlichte Eleganz' (simple elegance), 'ein schlichtes Design' (a simple design), 'schlichte Möbel' (plain furniture), or 'ein schlichtes Kleid' (a plain dress).
Mir gefällt das schlichte Design der skandinavischen Möbel.
I like the simple design of the Scandinavian furniture.
In its function as an intensifying adverb, 'schlicht' (simply/downright) often comes before adjectives that express an extreme or absolute quality. Common combinations are 'schlicht unmöglich' (simply impossible), 'schlicht falsch' (simply wrong), or 'schlicht beeindruckend' (simply impressive).
Es ist schlicht unmöglich, diese Aufgabe an einem Tag zu erledigen.
It is simply impossible to complete this task in one day.
In the meaning 'simple and understandable', 'schlicht' (simple) is often used with abstract nouns. A very common fixed expression is 'die schlichte Wahrheit' (the simple truth).
Manchmal ist die schlichte Wahrheit schwer zu akzeptieren.
Sometimes the simple truth is hard to accept.
simple / just
For an understated design, both „einfach“ and „schlicht“ can work. „Schlicht“ emphasizes more strongly that something is designed without decoration and deliberately unobtrusively, whereas „einfach“ can also generally mean modest or requiring little effort. Use „schlicht“ when the style is the focus.

Das Zimmer ist schlicht eingerichtet und wirkt durch seine klaren Formen ruhig.
The room is plainly furnished and feels calm because of its clean lines.
Das Zimmer ist einfach eingerichtet und hat nur die nötigen Möbel.
The room is simply furnished and has only the necessary furniture.