1.
loss of strength, going limp, relaxing muscles
The state of losing physical tension or strength, either intentionally (as in relaxation) or involuntarily (from shock, exhaustion, or disappointment).
全身の脱力を感じた。
I felt all the strength leave my body.
肩の力を抜いて脱力する。
To relax the shoulders and go limp.
結果を聞いて脱力してしまった。
When I heard the result, I went limp.
Implies disappointment or relief
2.
deadpan, low-key (humor/style)
A relaxed, understated quality, especially in comedy or creative works.
脱力系のユーモアだ。
It's deadpan humor.
あの芸人の脱力系のネタが好きだ。
I like that comedian's deadpan routines.
脱力感のあるイラストがSNSで人気を集めている。
Loose, relaxed illustrations are gaining popularity on social media.
COMMON COLLOCATIONS:
- 脱力する (to go limp, to lose strength)
- 脱力感 (a feeling of limpness/relaxation)
- 脱力系 (deadpan style, low-key style)
USAGE:
Sense 1 is used both medically (loss of muscle strength) and casually (going limp from exhaustion, disappointment, or relief). Sense 2 (脱力系) describes a deliberately understated, relaxed style in comedy, art, or fashion.