budovatelský

Etymology
From

Adjective

 * 1) of or related to construction of socialist society
 * 2)  of or related to building or builders, constructive
 * 1)  of or related to building or builders, constructive

Usage notes
In contemporary Czech the word is almost exclusively used in historical contexts or ironically (usually reflecting someone's excessive enthusiasm - see example above) due to its close association with Communist propaganda.