sem·i·rig·id 
(sĕm′ē-rĭjĭd, sĕm′ī-)
(sĕm′ē-rĭjĭd, sĕm′ī-)adj.
1. Partly or moderately rigid.
2. Being an airship designed with a rigid internal keel but without an internal framework.
- undergraduate
- underground
- Underground Railroad
- undergrown
- undergrowth
- underhair
- underhand
- underhanded
- underhandedly
- underhandedness
- under hat
- underhung
- underinsurance
- underinsured
- under/in the circumstances
- underived
- underkill
- underlaid
- underlain
- underlay
- underlay
- underlayment
- underlet
- underlie
- underline