反

to bend backwards; to bend oneself back

to be taken aback

to be turned inside out

to betray; to double-cross

to break into falsetto; to crack into falsetto; to squeak; to croak; to quaver

to straighten up and stick one's chest out; to throw oneself back (e.g. in a chair); to lean back (arrogantly)

to assume a haughty attitude; to behave arrogantly

to be contrary; to run counter (to); to conflict (with); to disagree (with)

rule violation; rule infraction; infringement of the rules

rebellion; revolt; insurrection; treason

conditioned reflex

to be awash with; to teem with; to be full of

contrary to one's expectations

breach of manners; breach of etiquette; faux pas

estrangement; alienation; disaffection; desertion; defection; breakaway

Medicine

(transplant) rejection

strong reaction (against)

turning over; flipping over

reply; response

marks written alongside characters in a classical Chinese text to indicate their ordering when read in Japanese

lapel

to be puffed up with pride; to throw out one's chest

bloody vomit

on the other hand

strong reaction (against)

Medicine

(transplant) rejection

Suru verb - special class

going against one's will; contrary to one's intentions; going against one's desire; going contrary to one's wishes

overreaction

chemical reaction

generation of an unexpected result from combining things

diffuse reflection; diffused reflection; irregular reflection

spinal reflex

mutual opposition; contrariety; contradiction

Genetics

repulsion

strong opposition; vehement opposition