How do you say "not modern"

You can say "not modern" directly, though more precise alternatives often communicate better depending on context and connotation. Traditional, old-fashioned, outdated, antiquated, dated, archaic, conventional, or classic each replace "not modern" with single-word precision. For neutral description without judgment, use traditional or conventional. For slight negativity suggesting obsolescence, use outdated or dated. For strong criticism, use antiquated, obsolete, or backward. For positive framing, use classic, timeless, or vintage.

Phrasing matters in different contexts: describing design as "not modern" sounds awkward compared to "traditional design" or "classical architecture." Describing technology as "not modern" becomes clearer as "outdated technology" or "legacy systems." Describing attitudes as "not modern" works better as "old-fashioned values" or "conservative views." Sometimes the negative construction serves a purpose—"This approach is not modern, but it remains effective" uses the phrasing to set up a contrast. Generally, choosing a specific positive term (traditional, classic, vintage) or negative term (outdated, obsolete, antiquated) communicates more precisely than the generic negation "not modern" and sounds more natural in both speech and writing.