Meaning of “unhealthy” - Learner’s Dictionary

unhealthy

adjective uk us /ʌnˈhelθi/
CAUSE ILLNESS

B1 likely to damage your health:

Eating too much is unhealthy.
ILL

B1 not strong, and likely to become sick:

She looks pale and unhealthy.
NOT NORMAL

not normal and slightly unpleasant:

an unhealthy interest in weapons

(Definition of “unhealthy” from the Cambridge Learner’s Dictionary © Cambridge University Press)