Alternative words you could use instead of the word…

Plain

As an adverb

Abruptly

Artlessly

Baldly

Bluffy

Bluntly

Brusquely

Candidly

Curtly

Directly

Earnestly

Forthrightly

Frankley

Gruffly

Honestly

Impolitely

Inconsiderately

Open heartedly

Openly

Plainly

Point blank

Rudely

Sharply

Simply

Sincerely

Straight

Straightforward

Straightforwardly

Straightforwards

Tactlessly

Truthful

Truthfully

Unguardedly

unreservedly

Veraciously