(s)lone, lonesome, only, sole, solitarybeing the only one; single and isolated from others“the lone doctor in the entire county”, “a lonesome pine”, “an only child”, “the sole heir”, “the sole example”, “a solitary instance of cowardice”, “a solitary speck in the sky”
(r)merely, simply, just, only, butand nothing more“I was merely asking”, “it is simply a matter of time”, “just a scratch”, “he was only a child”, “hopes that last but a moment”
(r)entirely, exclusively, solely, alone, onlywithout any others being included or involved“was entirely to blame”, “a school devoted entirely to the needs of problem children”, “he works for Mr. Smith exclusively”, “did it solely for money”, “the burden of proof rests on the prosecution alone”, “a privilege granted only to him”