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solid
/ˈsɒlɪd/
firm and stable
The table is solid and won't wobble.
The table is firmly constructed and stable.
general
Firm, stable, or not liquid/gaseous in form.
The ice cream must be kept solid at all times.
The ice cream must remain in a firm, non-melted state.
Opposite of liquid or gas. Often used for substances that maintain their shape.
general
Dependable, reliable, or trustworthy.
She is a solid friend who always keeps her promises.
She is a dependable friend who never lets others down.
Describes people, plans, or systems that are consistent and trustworthy.
general
Having no gaps or breaks; continuous.
The wall was painted in one solid color.
The wall was painted without any variations or patterns.
Used for surfaces, colors, or structures without interruptions.
informal
Substantial or of good quality.
That’s a solid plan for the weekend!
That’s a high-quality or excellent plan.
Common in casual praise, e.g., 'solid work!'
Collocations
solid groundfirm earth or stable foundationsolid evidenceconcrete proofsolid reputationtrustworthy standingsolid as a rockextremely stable or reliable
Related Phrases
Pro Tip
Physical vs. Figurative Use
Use 'solid' for physical stability (e.g., 'solid structure') and 'reliable' or 'trustworthy' for people/systems (e.g., 'solid employee').
Gold Rule
Avoid Redundancy
Don’t pair 'solid' with other intensifiers like 'very' or 'completely'—it’s already strong. Instead, use 'very reliable' for emphasis.
Word Origin
From Latin *solidus* (firm, dense), via Old French *solide*. Originally referred to physical density before expanding to metaphorical reliability.
Usage Notes
Commonly used in both literal (physical) and figurative (trustworthiness) contexts. Avoid confusing with 'solidarity' (unity) or 'solids' (plural noun for solid substances).
English Dictionary