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rock solid

ADJECTIVE
trustworthy/trusty
Synonyms
WEAK
accurate always there authentic authoritative convincing credible dependable ethical exact honest honorable kosher levelheaded mature on the level on the up and up open plausible principled realistic responsible righteous saintly secure sensible solid square steadfast straight there to be trusted tried tried-and-true true true-blue trustable truthful unfailing up-front upright valid veracious
Antonyms
WEAK
corrupt unbelievable undependable unreliable untrustworthy
ADJECTIVE
unfailing
Synonyms
STRONGEST
bottomless boundless eternal inexhaustible steadfast unflagging
WEAK
absolute assiduous ceaseless come-through consistent constant continual continuing continuous counted-on delivering dependable diligent dyed-in-the-wool endless faithful infallible invariable loyal never-failing persistent reliable same solid staunch straight sure surefire there tried-and-true true trustworthy unlimited unrelenting
Antonyms
STRONGEST
changing limited
WEAK
failing impermanent uncertain unsure
ADJECTIVE
well-founded
Synonyms
WEAK
based on hard data based on hard facts factual proven solid substantiated

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Certain principles must be applied wherever you are and although your team's strengths can and do vary, those principles must stay rock solid.

From BBC • Feb. 27, 2026

"We will be a rock solid, reliable supplier of LNG to Europe," Wright said.

From Barron's • Feb. 17, 2026

The fundamentals of the argument were rock solid.

From Slate • Feb. 12, 2026

His front-knee brace is rock solid, allowing hip and side to propel his action to find the kick and bounce from the flattest pitches.

From BBC • Jul. 24, 2025

I yanked on the padlock, but despite a thick encrustation of rust it seemed rock solid.

From "Miss Peregrine's Home for Peculiar Children" by Ransom Riggs