っぽい is used to describe something that seems to have a certain quality. Here, it means "his explanation seems overly complicated.

がち is used to describe a tendency or habit, often negative. Here, it means "she tends to get sick often and misses school.

げ is used to describe an appearance or manner that suggests a certain feeling. Here, it means "he was looking outside with lonely eyes.

がち is used to describe a tendency. Here, it means "he tends to be late.

気味 is used to express a slight tendency or feeling. Here, it means "she seemed slightly nervous.

っぽい is used to describe something that has a strong tendency or resemblance. Here, it means "this soup is too salty.

っぽい is used to describe something that resembles or has the qualities of something else. Here, it means "this painting looks childlike.

気味 (ぎみ) is used to express a slight tendency or feeling. Here, it means "I feel slightly tired.

げ is used to describe an appearance or manner. Here, it means "he looked at me with an anxious expression.

気味 is used to express a slight tendency or feeling. Here, it means "this computer is running slightly slow.