
schwach
weak
Having little physical strength or energy; the opposite of strong.
Nach der Grippe fühlte sie sich noch wochenlang schwach.
After the flu, she still felt weak for weeks.
weak
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weak
Having little physical strength or energy; the opposite of strong.
Nach der Grippe fühlte sie sich noch wochenlang schwach.
After the flu, she still felt weak for weeks.

weak / poor
Showing low performance, quality, or intensity.
Das war eine schwache Vorstellung der Heimmannschaft.
That was a weak performance by the home team.

weak / faint
Of low intensity; barely perceptible. Refers to light, sounds, signals, or even memories.
Das WLAN-Signal ist in diesem Zimmer sehr schwach.
The Wi-Fi signal is very weak in this room.

to give in
To be unable to resist a temptation or desire.
Immer wenn ich Kuchen sehe, werde ich schwach.
Whenever I see cake, I give in.

weak in
To have limited skills or knowledge in a particular area or subject.
Ich war in der Schule immer schwach in Physik.
At school, I was always weak in physics.

weak / flimsy
Not convincing or poorly supported. Refers to arguments, evidence, or excuses.
Seine Ausrede für die Verspätung war ziemlich schwach.
His excuse for being late was pretty weak.
'Schwach' (weak) belongs to a word family. The noun is 'die Schwäche' (weakness), and the verb is 'schwächen' (to weaken). All three words refer to the concept of low strength or intensity.
Jeder Mensch hat Stärken und Schwächen.
Every person has strengths and weaknesses.
The expression 'schwach werden' (to give in) means not being able to resist a temptation. It describes the moment of decision when you give in.
Bei Schokolade werde ich immer schwach.
I always give in when it comes to chocolate.
To express that you are not good at a particular subject or skill, you use the fixed structure 'schwach in' (weak in) + dative. Typical examples are school subjects or sports.
Mein Sohn ist schwach in Mathematik, aber gut in Sprachen.
My son is weak in mathematics, but good at languages.
The noun that 'schwach' (weak) describes reveals the exact meaning. A 'schwacher Kaffee' (weak coffee) has little aroma, a 'schwaches Argument' (weak argument) is not convincing, and a 'schwaches Herz' (weak heart) is a medical problem.
Dieser Kaffee ist mir zu schwach, ich mag ihn stärker.
This coffee is too weak for me; I like it stronger.
To describe low intensity, 'schwach' (weak/faint) is often combined with sensory perceptions or signals: 'schwaches Licht' (weak/faint light), 'schwacher Wind' (weak/light wind), 'schwache Stimme' (weak/faint voice), or 'schwaches Signal' (weak signal).
Im Keller ist das Licht ziemlich schwach.
The light in the basement is pretty weak.
When it is about the quality of ideas or justifications, typical collocations are 'ein schwaches Argument' (a weak argument), 'ein schwacher Beweis' (weak evidence), or 'eine schwache Ausrede' (a weak excuse).
Für seine Verspätung hatte er nur eine schwache Ausrede.
He only had a weak excuse for being late.
light / easy
Leicht and schwach can both express low intensity. Leicht generally reduces the perceived strength, while schwach emphasizes the limited force or effect in particular. Use leicht for a gentle wind; when its lack of force is important, schwach is more appropriate.

Der Wind ist so schwach, dass sich die Fahne kaum bewegt.
The wind is so weak that the flag hardly moves.
Ein leichter Wind sorgt auf der Terrasse für angenehme Abkühlung.
A light breeze provides pleasant cooling on the patio.