cheery
adj.feeling or showing that you are happy and positive. It describes someone who is in a good mood and acts in a bright, friendly way.
adj.characterised by or expressing good spirits and optimism. Often describes a person's disposition or the bright, pleasant quality of an object or environment.
“She gave me a cheery wave as she walked past.”
“Despite the rainy weather, the receptionist greeted every guest with a cheery smile and a helpful attitude.”
“The room was decorated in cheery yellow tones to counteract the gloomy atmosphere of the old building's narrow corridors.”
Often used to describe facial expressions, voices, or colors that suggest happiness.
From Middle English cheri, equivalent to cheer + -y.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.