Sentence:  Thus , for aqueous media , we can think of the idealized organic active as an oleophilic or <WSD>hydrophobic</WSD> surface-active agent , and of an idealized builder as a oleophobic or hydrophilic surface-active agent . 
Meaning of the word marked with <WSD> tags:  lacking affinity for water; tending to repel and not absorb water; tending not to dissolve in or mix with or be wetted by water