How can I filter out strings that contain no numbers within them?

Question

Input:

apple
orang3
123rat
ratty
123
app7e

Output:

apple
ratty

I am trying awk '$1 ~/[[:alpha:]]/' file but this only removes cases like 123 that are fully numerical but I also want app7e and orang3 to be removed.

Answer 1

To namely fit the condition "contain no numbers":

Simple grep approach:

grep -v '[0-9]' file

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Or the same with awk command:

awk '!/[0-9]/' file