Meaning of “bold” - Learner’s Dictionary

bold

adjective uk us /bəʊld/
NOT FRIGHTENED

B2 not frightened of taking risks:

It was a bold decision to go and live abroad.
COLOUR/SHAPE

B1 strong in colour or shape:

bold colours
a bold design
LETTERS

words that are printed in bold letters are darker and thicker than normal words

boldly adverb
boldness noun [ U ]

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