弱

weak-willed; lacking a purpose; lacking will power to be patient, purposeful, or resolute

the socially vulnerable; the weak of society; socially disadvantaged people

Proverb

misfortunes never come singly

person with limited access to information (via the Internet, television, etc.)

diminished capacity; diminished responsibility; legally unaccountable (e.g. due to mental illness, drugs, alcohol, etc.)

to soften one's voice

Medicine

psychasthenia

weak foreign policy; weak-kneed diplomacy

soft ground

infirm of purpose and lacking in decision

weak foreign policy; weak-kneed diplomacy

low-power transmission; weak signals

vulnerable road users (such as the elderly, mobility-impaired people and young children)

people without public transport access; transport poor

general prostration

Physics

weak interaction

feminine poetic style (e.g. in the Man'yōshū)

person of diminished capacity (e.g. drugs, alcohol, mental retardation, etc.)

to languish

Proverb

followers take after their leaders; there are no cowardly soldiers under a brave general

weak-hearted approach; soft line; easier way (route)

inbreeding depression

having a weak chest

mildly air-conditioned railway carriage

very low flame (cooking); lowest heat