Healthy. Healthy is mainly used as an adjective, but in English, under normal circumstances, adverbs of adjectives are directly followed by ly, which is an adjective ending in consonants and Y. When pronounced as /i/, Y is changed to I and then to ly. Healthy is an adjective, meaning "healthy". It ends with a consonant letter plus Y and is pronounced as /i/, so its adverb is to change Y into I and then add ly, meaning "healthy".

Other variants of health: optimal health, relative health.

Phrase collocation: healthydiet balanced diet; Healthy diet; A healthy diet; Eat healthily. Healthytea health tea; Healthy tea; Health tea; Healthy tea.