i-adjective
uncontainable; irrepressible; uncontrollable
Describes an emotion, impulse, or physical reaction that cannot be held back. Often used with feelings like laughter, anger, tears, or excitement.
彼の冗談に、笑いが抑えきれなかった。
I couldn't hold back my laughter at his joke.
怒りが抑えきれず、声を荒げてしまった。
Unable to contain my anger, I raised my voice.
I couldn't hold back tears of emotion.
The base verb meaning 'to hold back, suppress'. 抑えきれない is its potential negative form with 切る, meaning 'cannot completely suppress'.
Similar meaning, but こらえる focuses on enduring or bearing something internally, while 抑える implies actively suppressing an outward expression.
Compound of 抑える (osae, 'to suppress') + 切れない (kirenai, 'cannot completely do'), the negative potential form of 切る (kiru, 'to cut/do thoroughly').