the faint of heart

the faint of heart

A person who tends to easily experience stress, fear, anxiety, sickness, or discomfort when facing unpleasantness, graphic imagery, physical strain, or risk. We must warn you that the following video contains images that may be unsuitable for the faint of heart. Part of the hike is along a narrow path very close to a sheer cliff, so it's certainly not for the faint of heart!
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faint of heart

Fig. people who are squeamish; someone who is sickened or disturbed by unpleasantness or challenge. The pathway around the top of the volcano, near the crater, is not for the faint of heart.
See also: faint, heart, of