Translation guide
Describes something that has reached full development, status, or qualification. In Japanese, this is expressed through adjectives, verbs, or set phrases depending on whether you mean 'fully qualified', 'complete', or 'fully developed'.
To describe someone who has completed training and is now a full member of a profession or group.
He became a fully fledged doctor.
I want to be treated as a fully fledged adult.
Means 'full-scale' or 'genuine'. Used for things or activities that are done in earnest, not just as a hobby or trial.
He is a fully fledged chef.
Means 'formal' or 'official'. Used when someone has officially obtained a status or title.
She became a fully fledged member.
To describe something that has reached its final, complete form.
Means 'complete' or 'perfect'. A general-purpose adjective for something fully developed.
This is not a fully fledged solution.
Also used for things that are full-scale or fully implemented, not just a prototype or small version.
Means 'matured' or 'ripened'. Used for systems, markets, or technologies that have fully developed over time.
This is a fully fledged market.
The literal meaning of a young bird that has grown its flight feathers and is ready to fly.
Literally 'feathers have fully grown'. Used in biological or poetic contexts.
The chick, now fully fledged, soon flew away.
一人前 is mainly for people who have reached a level of competence or independence. 本格的 is for things or activities that are full-scale or genuine, not half-hearted. For a person, 一人前 implies skill and maturity; 本格的 implies they are serious/professional in their approach.
Do not translate 'fully fledged' literally as 完全に羽の生えた unless you are talking about birds. For people and things, use the expressions above.
The company launched a fully fledged online service.