Firmly believe

Meaning

To be completely sure that something is true or right.

The coach firmly believes that discipline matters more than raw talent.

Usually followed by a 'that' clause or 'in': 'firmly believe in equality'. 'Strongly' and 'truly believe' are also natural.

The app adds a real dialogue, native audio and three quiz types for every collocation, and it works offline.

express an opinionto say or show what you think about something
voice concernto say openly that you are worried about something
strongly disagreeto have an opinion that is very different from someone else's
open to discussionnot yet decided, so people can still talk about it and suggest changes
hit the nail on the headto describe exactly what is causing a situation or problem