concerned chiefly or only with yourself and your advantage to the exclusion of others; "Selfish men were...trying to make capital for themselves out of the sacred cause of civil rights"- Maria Weston Chapman
immoderately desirous of acquiring e.g. wealth; "they are avaricious and will do anything for money"; "casting covetous eyes on his neighbor's fields"; "a grasping old miser"; "grasping commercialism"; "greedy for money and power"; "grew richer and greedier"; "prehensile employers stingy with raises for their employees"
march aggressively into another's territory by military force for the purposes of conquest and occupation; "Hitler invaded Poland on September 1, 1939"
penetrate or assault, in a harmful or injurious way; "The cancer had invaded her lungs"
occupy in large numbers or live on a host; "the Kudzu plant infests much of the South and is spreading to the North"
avoiding waste; "an economical meal"; "an economical shopper"; "a frugal farmer"; "a frugal lunch"; "a sparing father and a spending son"; "sparing in their use of heat and light"; "stinting in bestowing gifts"; "thrifty because they remember the great Depression"; "`scotch' is used only informally"