
matt
weak
To feel physically weak, powerless, and without energy, often as a result of illness or exertion.
Nach der Grippe fühlte sie sich noch tagelang matt und müde.
After the flu, she still felt weak and tired for days.
weak / matte
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weak
To feel physically weak, powerless, and without energy, often as a result of illness or exertion.
Nach der Grippe fühlte sie sich noch tagelang matt und müde.
After the flu, she still felt weak and tired for days.

matte
Describes a surface that does not shine or reflect, but instead has a dull, non-glossy appearance.
Die Wände sind in einem matten Weiß gestrichen, um Reflexionen zu vermeiden.
The walls are painted in a matte white to avoid reflections.

checkmate
Refers in chess to the situation in which the king is directly attacked and cannot escape the attack, which means the end of the game.
Mit dem Zug der Dame auf H7 ist der gegnerische König matt.
With the queen's move to H7, the opposing king is in checkmate.

muted
Describes a color that is not bright or intense, but rather pale, subdued, or dull-looking.
Sie trug ein elegantes Kleid in einem matten Grün.
She wore an elegant dress in a muted green.
To express physical weakness, 'matt' (weak) is often used in the combination 'sich matt fühlen' (to feel weak) or as part of 'matt und müde' (weak and tired). It describes a state of lacking energy.
Ich fühle mich heute irgendwie matt und antriebslos.
I feel somehow weak and listless today.
When 'matt' (matte) describes a surface, it is always about the absence of shine. Typical nouns in this context are 'Farbe' (paint), 'Lack' (varnish/lacquer), 'Papier' (paper), or 'Foto' (photo).
Für das Porträt hat der Fotograf mattes Papier verwendet.
The photographer used matte paper for the portrait.
The meaning 'Schachmatt' (checkmate) is reserved exclusively for the game of chess. You can recognize it immediately from the context with words like 'König' (king), 'Zug' (move), 'Partie' (game), or 'Schach' (chess).
Nach nur zwanzig Zügen war der Weltmeister matt.
After only twenty moves, the world champion was checkmated.
In a chess context, there are two typical constructions: You can say 'Der König ist matt' (The king is in checkmate) as a state, or use the verb 'jemanden matt setzen' (to checkmate someone) for an action.
Sie hat ihn mit einem überraschenden Zug matt gesetzt.
She checkmated him with a surprising move.
When 'matt' (muted) describes a color, it stands directly before the color name. It then means 'not bright' or 'subdued'. Examples are 'ein mattes Grün' (a muted green) or 'ein mattes Blau' (a muted blue).
Die Bluse hatte ein mattes Rosa, das sehr elegant wirkte.
The blouse had a muted pink that looked very elegant.
tired
When referring to the effects of illness or exertion, both “müde” and “matt” can fit. “Müde” mainly emphasizes the need for sleep or rest, while “matt” emphasizes physical weakness and a lack of strength. Someone who wants to sleep is more likely to be müde; someone who can barely move with any strength is more likely to be matt.

Nach dem Fieber bin ich matt und kann kaum aufstehen.
After the fever, I’m weak and can barely get up.
Nach dem Fieber bin ich müde und möchte lange schlafen.
After the fever, I’m tired and want to sleep for a long time.