big talker

All mouth, nothing else

A big talker is someone who makes grand claims or promises but fails to follow through.

The phrase implies boastfulness without substance—all talk, no action: He said he'd revolutionize the company, but he turned out to be just a big talker.

Sometimes used self-deprecatingly: I'm a big talker until it's time to actually do it.

Opposites
action vs. empty words

big talkerdoer

Person who acts

man of action · go-getter · achiever · walks the walk · practitioner

verbal expressiveness

big talkerstrong silent type

Reserved yet capable archetype

quiet type · man of few words · woman of few words · introvert · wallflower

authenticity and reliability

big talkerstraight shooter

Forthright, blunt person

man of his word · truth-teller · genuine article

Family

big, talk, talks, talking, talkative, bigger, biggest, talker, bigly

Familiarity
Top 100,000
Profile
Known to kids · Used worldwide · Timeless · Negative · Everyday, not technical · Rated G