2 Added some alternatives
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The word was probably "intent".

The man was intent on his work.

This implies a state of focus or deep involvement without stress or panic.

Less likely but still good alternatives might be "attentive", "earnest", "rapt", "preoccupied", "immersed", "engaged", or "concentrated".

The word was probably "intent".

The man was intent on his work.

This implies a state of focus or deep involvement without stress or panic.

The word was probably "intent".

The man was intent on his work.

This implies a state of focus or deep involvement without stress or panic.

Less likely but still good alternatives might be "attentive", "earnest", "rapt", "preoccupied", "immersed", "engaged", or "concentrated".

1
source | link

The word was probably "intent".

The man was intent on his work.

This implies a state of focus or deep involvement without stress or panic.