2 our more conservative neighbors may object to the modern architecture being proposed
traditionalist, traditional, conventional, orthodox, old-fashioned, dyed-in-the-wool, hidebound, unadventurous, set in one's ways;
moderate, middle-of-the-road, buttoned-down
4 a conservative estimate
low, cautious, understated, moderate, reasonable
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I never dared be radical when young for fear it would make me conservative when old.
Robert Frost "Precaution" ( 1936)