fake smile; forced smile
A smile put on deliberately, not from genuine feeling. Often used when someone hides their true emotions.
She greeted me with a fake smile.
Forced smiles can be tiring sometimes.
苦笑い is a wry or bitter smile, showing discomfort, whereas 作り笑顔 is a consciously manufactured smile.
Compound of 作り (tsukuri, 'made, artificial') and 笑顔 (egao, 'smiling face').