The term "more crossable" denotes the quality of being easy to cross. Antonyms of this phrase would refer to the opposite quality of being difficult or impossible to cross. Some possible words include "impassable," "uncrossable," "inaccessible," "untraversable," and "unfordable." These words suggest obstacles that prevent people or vehicles from traversing a particular terrain or obstacle. Examples include rivers, mountains, cliffs, swamps, and deserts. Conversely, words like "navigable," "easily crossable," or "accessible" would be synonyms of "more crossable" and suggest the ability to move with ease across a particular terrain or obstacle.