kind and pleasant

they were friendly to me

she gave me a friendly smile

denoting something that is adapted for or is not harmful to a specified thing

an environment-friendly agronomic practice

child-friendly policies

favourable or serviceable

no one noticed her as she slipped out—it was a friendly night

(of troops or equipment) of, belonging to, or allied with one's own forces

the risk of blowing up friendly forces is minimized

a game or match that does not form part of a serious competition

England will play two friendlies in Sardinia