Grammar fix
an adverse effect
unfavourable effect (formal/neutral)
a negative or harmful result caused by something, especially used in formal or technical contexts such as health, policy, or science.
Hear it in context
Notice where the phrase sounds natural.
The new medication had an adverse effect on some patients, causing headaches and nausea.
While technology has brought many benefits, it can also have an adverse effect on young people's attention spans if not used responsibly.
Fix the pattern
One small grammar move makes it sound right.
Not: I'm not adverse to the idea.
Say: I'm not averse to the idea.
'Averse' = reluctant; 'adverse' = harmful. Don't mix them up.
Which sounds natural?
Tap the one a native speaker would say.
'Engender deleterious effects' is medical-formal; in speech people say 'side effects'.
Build natural chunks
Words that usually travel with it.
an adverse effect on
- on
- have
- any
- serious