Unlikely to crack a smile, say

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Possible Answers:

STOIC.

Last seen on: NY Times Crossword 13 Jan 21, Wednesday

Random information on the term “STOIC”:

Red, usually in all caps as RED, is a screen editor for the VAX/VMS operating system using VT100 terminals. It was designed to be efficient in an interactive environment. RED’s syntax is similar to TECO’s. It supports cut/paste and user-written macros.RED is written in the STOIC programming language.

STOIC on Wikipedia