rigid
US /ˈrɪdʒ.ɪd/
UK /ˈrɪdʒ.ɪd/
1.
unable to bend or be forced out of shape; not flexible.
:
•
The old man's body was rigid with cold.
•
The plastic became rigid after it cooled.
2.
unable to change or be adapted
:
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The company has a rigid policy on returns.
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His thinking was too rigid to accept new ideas.