Offbeat and Suppositious

Offbeat adjective - Different from the ordinary in a way that causes curiosity or suspicion.

Suppositious and offbeat are semantically related. In some cases you can use "Suppositious" instead an adjective "Offbeat".

Suppositious adjective - Based primarily on surmise rather than adequate evidence.

Offbeat and suppositious are semantically related. Sometimes you can use "Offbeat" instead an adjective "Suppositious".