Closest meaning of word rigid is stiff and inflexible, capturing core idea of not bending or changing easily. For physical objects, closest meaning is stiff, meaning object does not flex or bend under pressure, such as rigid board meaning stiff board. For rules and behavior, closest meaning is inflexible, meaning not adaptable or not willing to change, such as rigid rules meaning inflexible rules. Other close meanings include unyielding, unbending, firm, and strict, all emphasizing resistance to bending or changing. Rigid means something holds its shape and does not give way, whether material that does not bend or person who does not compromise. So closest synonym that works in most contexts is stiff for physical and inflexible for figurative, both conveying lack of flexibility. Antonym is flexible, so closest meaning is opposite of flexible, meaning stiff, firm, and unadaptable.
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