Weak
/wiːk/
adjective
Lacking in force (usually strength) or ability.
“The child was too weak to move the boulder.”
Unable to sustain a great weight, pressure, or strain.
“a weak timber; a weak rope”
Unable to withstand temptation, urgency, persuasion, etc.; easily impressed, moved, or overcome; accessible; vulnerable.
“weak resolutions; weak virtue”
Synonyms: assailable, feeble, frail, powerless, vincible, vulnerable, dilute, watery