THESAURUS
militate against
antagonize, battle, be antipathetic, be inimical, beat against, beat up against, breast the wave, buck, buffet, buffet the waves, clash, close with, collide, combat, compete with, conflict, conflict with, confute, contend against, contest, contradict, contrapose, contravene, counter, counteract, counterattack, counterpose, countervail, counterwork, cross, fight, fight against, go against, go counter to, grapple with, interfere with, join battle with, labor against, lock horns, meet head-on, offer resistance, oppose, oppugn, reluct, reluctate, resist, rival, run against, run counter to, stem the tide, strive against, struggle against, swim upstream, take on, vie with, work against
ROGET THESAURUS
militate against
Opposition
VB
oppose, counteract, run counter to, withstand, control, hinder, antagonize, oppugn, fly in the face of, go dead against, kick against, fall afoul of, run afoul of, set against, pit against, face, confront, cope with, make a stand, make a dead set against, set oneself against, set one's face against, protest against, vote against, raise one's voice against, disfavor, turn one's back upon, set at naught, slap in the face, slam the door in one's face, be at cross purposes, play at cross purposes, counterwork, countermine, thwart, overthwart, work against, undermine, stem, breast, encounter, stem the tide, breast the tide, stem the current, stem the flood, buffet the waves, beat up against, make head against, grapple with, kick against the pricks, contend, do battle with, do battle against, contradict, contravene, belie, go against, run against, beat against,
militate against, come in conflict with, emulate, rival, spoil one's trade.
Counteraction
VB
counteract, run counter, clash, cross, interfere with, conflict with, contravene, jostle, go against, run against, beat against,
militate against, stultify, antagonize, block, oppose, traverse, withstand, hinder, repress, react, undo, neutralize, counterpoise, overpoise.