1. (adjective) not accessible to view

• hidden
• out of sight

1. (adjective) not accessible to view

• invisible
• unseeable

2. (adjective) hidden on any grounds for any motive

• bushwhacking
• dark
• furtive
• sneak
• sneaky
• stealthy
• surreptitious
• hidden
• obscure
• hidden
• secret
• incognito
• lying in wait
• sealed
• secret
• sneaking
• unavowed

1. (adjective) hidden on any grounds for any motive

• covert

1. (adjective) hidden on any grounds for any motive

• unconcealed