to keep someone from doing, to stop, to prevent...

obstruction, prevention, hindrance...

obstruction, impediment, hindrance...

obstruction, impediment, hindrance...

obstruction, impediment, hindrance...

morning sickness, nausea and vomiting of pregnancy

loss of spirit, dejection

separation, estrangement

rejection

steep (terrain), precipitous, precipice...

obstruent

inhibitor

nausea triggered by seeing one's partner experiencing morning sickness, sympathetic pregnancy

barrage balloon

feeling sick when one's stomach is empty during pregnancy (usu. instead of experiencing morning sickness)

morning sickness (as opposed to certain other forms of illnesses experienced during pregnancy), nausea and vomiting of pregnancy

(extreme) sleepiness during pregnancy, pregnancy fatigue

to obstruct one's way

hyperemesis gravidarum, HG, severe morning sickness

depressed in spirits, rejection, disheartened...

demoralization, collapse of morale, one's morale being shaken

standing firmly against

road block

to hinder the growth of (e.g. plants, someone), to hamper the growth of

protease inhibitor

battlefield air interdiction

selective serotonin reuptake inhibitor, SSRI

macrophage migration inhibitory factor, MMIF

justifiable cause for noncompliance with the law

carbonate dehydratase inhibitor