The term 'Not at All Lax' can be summarized by two crossword solutions: 'STERN' (5 letters) and 'TAUT' (4 letters). 'STERN' is an adjective meaning severe, strict, or harsh. It is often used to describe someone's demeanor or attitude. 'TAUT' is an adjective meaning tight, stretched, or firm. It is often used to describe a rope or other material that has been pulled tight. Together, these two words describe something that is not lax, or loose, but rather is strict and tight.