ekelhaft
disgusting
Causing disgust or revulsion, usually referring to smell, taste, or appearance; repulsive.
Der Geruch von verfaultem Essen ist einfach ekelhaft.
The smell of rotten food is simply disgusting.

disgusting
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disgusting
Causing disgust or revulsion, usually referring to smell, taste, or appearance; repulsive.
Der Geruch von verfaultem Essen ist einfach ekelhaft.
The smell of rotten food is simply disgusting.

The adjective 'ekelhaft' (disgusting) is derived from the noun 'der Ekel' (disgust, revulsion). The ending '-haft' means 'of the nature of' or 'full of'. So something that is 'ekelhaft' causes disgust.
Ich empfinde einen großen Ekel vor Spinnen.
I feel great disgust toward spiders.
You can recognize the meaning by what is being described. If 'ekelhaft' refers to food, smells, or dirt, the literal meaning is intended. If it refers to behavior, statements, or a person, the moral meaning is intended.
Diese Suppe schmeckt ekelhaft.
This soup tastes disgusting.
'Ekelhaft' can also be used as an adverb to describe an action. In this case, it remains unchanged after the verb.
Das Badezimmer stinkt ekelhaft.
The bathroom smells disgusting.
nauseous / bad
'übel' and 'ekelhaft' can both describe something that is very unpleasant or repulsive. 'ekelhaft' fits especially well when something causes disgust, for example because of its smell, taste, or appearance. It can also describe mean behavior. 'übel' is somewhat broader: it can refer to a very bad smell or taste, but also to morally bad behavior. In addition, 'übel' is used in other fixed meanings, for example when someone feels sick. If you want to strongly emphasize disgust, 'ekelhaft' usually sounds more natural.

Die verschimmelte Suppe sah ekelhaft aus.
The moldy soup looked disgusting.
Im Keller roch es übel, weil dort alte Lebensmittel lagen.
It smelled foul in the basement because there was old food there.