外形 (がいけい, gaikei) Japanese meaning: external form | KotomoraThe external form of this machine is simple, but the inside is complex.
You can't judge the quality from the outer shape alone.
Word family
external; outward; in appearance
external dimensions; outside measurements
dual corporate tax system
Etymology
Compound of 外 (outside) and 形 (shape, form). The reading がいけい is the standard on'yomi combination.