| facile(simple, straightforward, basic, fundamental, uncomplicated) |
| foundational(simple, straightforward, basic, fundamental, undemanding) |
| fundamental(simple, straightforward, basic, uncomplicated) |
| homely |
| ingenuous(adjective, simplicity) |
| initial(simple, straightforward, basic, fundamental, uncomplicated) |
| introductory(simple, straightforward, basic, fundamental, uncomplicated) |
| meat and potatoes(expression, idiom, simple, straightforward, basic) |
| modest |
| one-way |
| original(simple, straightforward, basic, fundamental, uncomplicated) |
| prefatory(simple, straightforward, basic, fundamental, uncomplicated) |
| preliminary(simple, straightforward, basic, fundamental, uncomplicated) |
| primary(simple, straightforward, basic, uncomplicated) |
| primitive(simple, straightforward, basic, fundamental, uncomplicated) |
| primo(simple, straightforward, basic, fundamental, undemanding) |
| rudimental(adjective, undemanding, realizable, elementary, primo) |
| rudimentary(simple, straightforward, basic, fundamental, uncomplicated) |
| simpleminded |
| simpler |