1. (adjective) not officially recognized or controlled

• loose

2. (adjective) having or fostering a warm or friendly and informal atmosphere

• cozy
• intimate

1. (adjective) not formal

• casual
• daily
• everyday
• casual
• free-and-easy
• folksy
• unceremonial
• unceremonious

2. (adjective) not officially recognized or controlled

• unofficial

3. (adjective) used of spoken and written language

• colloquial
• conversational
• common
• vernacular
• vulgar
• epistolary
• epistolatory
• nonliterary
• unliterary
• slangy
• subliterary

4. (adjective) having or fostering a warm or friendly and informal atmosphere

• friendly

1. (adjective) used of spoken and written language

• unrhetorical

1. (adjective) not formal

• ease
• informality

2. (adjective) having or fostering a warm or friendly and informal atmosphere

• cosiness
• coziness
• snugness
• informality

1. (adjective) not formal

• formal

2. (adjective) used of spoken and written language

• formal